[PATCH 00/13] mvneta Buffer Management and enhancements
Gregory CLEMENT
gregory.clement at free-electrons.com
Wed Dec 2 02:40:22 PST 2015
Hi Marcin,
On mer., déc. 02 2015, Marcin Wojtas <mw at semihalf.com> wrote:
> Gregory,
>
> Please apply below patch:
> http://pastebin.com/t42xyU3i
> It will confirm if there's an overflow for CS0 size in your setup.
> Please let know.
Indeed it is an overflow. In v4.0 the size was correct because it was no
longer compute as is: w->size = (size | ~DDR_SIZE_MASK) + 1;
But the commit was reverted because it caused other issues.
>
> So far the issue may have been not noticed, because in every IO driver
> using mvebu_mbus_dram_info for configuring MBUS windows, there's
> following substraction:
> (cs->size - 1) & 0xfffff000
>
> I think there are two options:
> 1. Change size type to u64.
If we switch to u64 we really must pay attention to be sure that it
won't be used to be written in a register, but the regsiter remains
32bits.
> 2. Change condition in mvebu_mbus_get_dram_win_info to:
> if (cs->base <= phyaddr && phyaddr <= (cs->base + cs->size -1))
I think it would be the best solution.
Gregory
>
> I'm looking forward to your information and opinion.
>
> Best regards,
> Marcin
>
> 2015-12-01 22:40 GMT+01:00 Marcin Wojtas <mw at semihalf.com>:
>> Hi Gregory,
>>
>> Thanks for the log. I think it may be an overall problem with 4GB size
>> representation in mvebu_mbus_dram_info structure? Maybe whole DRAM
>> space is associated to CS0, and the 4GB size (0x1 0000 0000) does not
>> fit u32 variable?
>>
>> Best regards,
>> Marcin
>>
>> 2015-12-01 14:12 GMT+01:00 Gregory CLEMENT <gregory.clement at free-electrons.com>:
>>> Hi Marcin,
>>>
>>> On lun., nov. 30 2015, Marcin Wojtas <mw at semihalf.com> wrote:
>>> [...]
>>>>>> 5. Enable BM on Armada XP and 38X development boards - those ones and
>>>>>> A370 I could check on my own. In all cases they survived night-long
>>>>>> linerate iperf. Also tests were performed with A388 SoC working as a
>>>>>> network bridge between two packet generators. They showed increase of
>>>>>> maximum processed 64B packets by ~20k (~555k packets with BM enabled
>>>>>> vs ~535 packets without BM). Also when pushing 1500B-packets with a
>>>>>> line rate achieved, CPU load decreased from around 25% without BM vs
>>>>>> 18-20% with BM.
>>>>>
>>>>> I was trying to test the BM part of tour series on the Armada XP GP
>>>>> board. However it failed very quickly during the pool allocation. After
>>>>> a first debug I found that the size of the cs used in the
>>>>> mvebu_mbus_dram_info struct was 0. I have applied your series on a
>>>>> v4.4-rc1 kernel. At this stage I don't know if it is a regression in the
>>>>> mbus driver, a misconfiguration on my side or something else.
>>>>>
>>>>> Does it ring a bell for you?
>>>>
>>>> Frankly, I'm a bit surprised, I've never seen such problems on any of
>>>> the boards (AXP-GP/DB, A38X-DB/GP/AP). Did mvebu_mbus_dram_win_info
>>>> function exit with an error? Can you please apply below diff:
>>>> http://pastebin.com/2ws1txWk
>>>
>>> Yes it exited with errors and I added the same kind traces. It was how I
>>> knew that the size was 0!
>>>
>>> I've just rebuild a fresh kernel using mvebu_v7_defconfig and adding
>>> your patch, I got the same issue (see the log at the end of the email.)
>>>
>>>
>>> But the good news is that on the same kernel on Armada 388 GP the pool
>>> allocation does not fail. I really suspect an issue with my u-boot.
>>>
>>>
>>>> And send me a full log beginning from u-boot?
>>>>
>>>>>
>>>>> How do you test test it exactly?
>>>>> Especially on which kernel and with which U-Boot?
>>>>>
>>>>
>>>> I've just re-built the patchset I sent, which is on top of 4.4-rc1.
>>>>
>>>> I use AXP-GP, 78460 @ 1600MHz, 2GB DRAM, and everything works fine. My
>>>> u-boot version: v2011.12 2014_T2.0_eng_dropv2.
>>>
>>> My config is AXP-GP, 78460 @ 1300MHz, 8GB DRAM (only 4GB are used
>>> because I didn't activated LPAE), but the main difference is the U-Boot
>>> version: v2011.12 2014_T2.eng_dropv1.ATAG-test02.
>>>
>>> Thanks,
>>>
>>> Gregory
>>>
>>>
>>> [ 0.000000] Booting Linux on physical CPU 0x0
>>> [ 0.000000] Linux version 4.4.0-rc1-00013-g76f111f9bdf8-dirty (gclement at FE-laptop) (gcc version 5.2.1 20151010 (Ubuntu 5.2.1-22ubuntu1) ) #1024 SMP Tue Dec 1 14:02:52 CET 2015
>>> [ 0.000000] CPU: ARMv7 Processor [562f5842] revision 2 (ARMv7), cr=10c5387d
>>> [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, PIPT instruction cache
>>> [ 0.000000] Machine model: Marvell Armada XP Development Board DB-MV784MP-GP
>>> [ 0.000000] Memory policy: Data cache writealloc
>>> [ 0.000000] PERCPU: Embedded 12 pages/cpu @ee1ac000 s18752 r8192 d22208 u49152
>>> [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 981504
>>> [ 0.000000] Kernel command line: console=ttyS0,115200 earlyprintk mvneta.rxq_def=2
>>> [ 0.000000] log_buf_len individual max cpu contribution: 4096 bytes
>>> [ 0.000000] log_buf_len total cpu_extra contributions: 12288 bytes
>>> [ 0.000000] log_buf_len min size: 16384 bytes
>>> [ 0.000000] log_buf_len: 32768 bytes
>>> [ 0.000000] early log buf free: 14924(91%)
>>> [ 0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes)
>>> [ 0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
>>> [ 0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
>>> [ 0.000000] Memory: 3888204K/3932160K available (5576K kernel code, 251K rwdata, 1544K rodata, 4460K init, 207K bss, 43956K reserved, 0K cma-reserved, 3145728K highmem)
>>> [ 0.000000] Virtual kernel memory layout:
>>> [ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB)
>>> [ 0.000000] fixmap : 0xffc00000 - 0xfff00000 (3072 kB)
>>> [ 0.000000] vmalloc : 0xf0800000 - 0xff800000 ( 240 MB)
>>> [ 0.000000] lowmem : 0xc0000000 - 0xf0000000 ( 768 MB)
>>> [ 0.000000] pkmap : 0xbfe00000 - 0xc0000000 ( 2 MB)
>>> [ 0.000000] modules : 0xbf000000 - 0xbfe00000 ( 14 MB)
>>> [ 0.000000] .text : 0xc0008000 - 0xc06fc374 (7121 kB)
>>> [ 0.000000] .init : 0xc06fd000 - 0xc0b58000 (4460 kB)
>>> [ 0.000000] .data : 0xc0b58000 - 0xc0b96d00 ( 252 kB)
>>> [ 0.000000] .bss : 0xc0b96d00 - 0xc0bcaa58 ( 208 kB)
>>> [ 0.000000] Hierarchical RCU implementation.
>>> [ 0.000000] Build-time adjustment of leaf fanout to 32.
>>> [ 0.000000] NR_IRQS:16 nr_irqs:16 16
>>> [ 0.000000] L2C: DT/platform modifies aux control register: 0x1a69ef10 -> 0x1a69ef12
>>> [ 0.000000] Aurora cache controller enabled, 32 ways, 2048 kB
>>> [ 0.000000] Aurora: CACHE_ID 0x00000100, AUX_CTRL 0x1a69ef12
>>> [ 0.000000] Switching to timer-based delay loop, resolution 40ns
>>> [ 0.000004] sched_clock: 32 bits at 25MHz, resolution 40ns, wraps every 85899345900ns
>>> [ 0.000015] clocksource: armada_370_xp_clocksource: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 76450417870 ns
>>> [ 0.000305] Console: colour dummy device 80x30
>>> [ 0.000322] Calibrating delay loop (skipped), value calculated using timer frequency.. 50.00 BogoMIPS (lpj=250000)
>>> [ 0.000332] pid_max: default: 32768 minimum: 301
>>> [ 0.000417] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes)
>>> [ 0.000425] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes)
>>> [ 0.000737] CPU: Testing write buffer coherency: ok
>>> [ 0.000880] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
>>> [ 0.001006] Setting up static identity map for 0x8280 - 0x82d8
>>> [ 0.001224] mvebu-soc-id: MVEBU SoC ID=0x7846, Rev=0x2
>>> [ 0.001321] mvebu-pmsu: Initializing Power Management Service Unit
>>> [ 0.002062] Booting CPU 1
>>> [ 0.004402] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
>>> [ 0.004645] Booting CPU 2
>>> [ 0.006984] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002
>>> [ 0.007219] Booting CPU 3
>>> [ 0.009558] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003
>>> [ 0.009605] Brought up 4 CPUs
>>> [ 0.009615] SMP: Total of 4 processors activated (200.00 BogoMIPS).
>>> [ 0.009620] CPU: All CPU(s) started in SVC mode.
>>> [ 0.009957] devtmpfs: initialized
>>> [ 0.012369] VFP support v0.3: implementor 56 architecture 2 part 20 variant 9 rev 6
>>> [ 0.012525] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
>>> [ 0.012657] pinctrl core: initialized pinctrl subsystem
>>> [ 0.013188] NET: Registered protocol family 16
>>> [ 0.013368] DMA: preallocated 256 KiB pool for atomic coherent allocations
>>> [ 0.040064] cpuidle: using governor ladder
>>> [ 0.070061] cpuidle: using governor menu
>>> [ 0.075168] hw-breakpoint: Debug register access (0xee003e17) caused undefined instruction on CPU 3
>>> [ 0.075172] hw-breakpoint: Debug register access (0xee003e17) caused undefined instruction on CPU 1
>>> [ 0.075176] hw-breakpoint: Debug register access (0xee003e17) caused undefined instruction on CPU 2
>>> [ 0.075179] hw-breakpoint: CPU 1 failed to disable vector catch
>>> [ 0.075196] hw-breakpoint: Debug register access (0xee003e17) caused undefined instruction on CPU 0
>>> [ 0.110815] vgaarb: loaded
>>> [ 0.110981] SCSI subsystem initialized
>>> [ 0.111306] usbcore: registered new interface driver usbfs
>>> [ 0.111349] usbcore: registered new interface driver hub
>>> [ 0.111398] usbcore: registered new device driver usb
>>> [ 0.111640] Advanced Linux Sound Architecture Driver Initialized.
>>> [ 0.111991] Bluetooth: Core ver 2.21
>>> [ 0.112024] NET: Registered protocol family 31
>>> [ 0.112029] Bluetooth: HCI device and connection manager initialized
>>> [ 0.112040] Bluetooth: HCI socket layer initialized
>>> [ 0.112048] Bluetooth: L2CAP socket layer initialized
>>> [ 0.112067] Bluetooth: SCO socket layer initialized
>>> [ 0.112462] clocksource: Switched to clocksource armada_370_xp_clocksource
>>> [ 0.119267] NET: Registered protocol family 2
>>> [ 0.119629] TCP established hash table entries: 8192 (order: 3, 32768 bytes)
>>> [ 0.119690] TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
>>> [ 0.119749] TCP: Hash tables configured (established 8192 bind 8192)
>>> [ 0.119791] UDP hash table entries: 512 (order: 2, 16384 bytes)
>>> [ 0.119814] UDP-Lite hash table entries: 512 (order: 2, 16384 bytes)
>>> [ 0.119945] NET: Registered protocol family 1
>>> [ 0.120143] RPC: Registered named UNIX socket transport module.
>>> [ 0.120150] RPC: Registered udp transport module.
>>> [ 0.120155] RPC: Registered tcp transport module.
>>> [ 0.120160] RPC: Registered tcp NFSv4.1 backchannel transport module.
>>> [ 0.290263] hw perfevents: enabled with armv7_cortex_a9 PMU driver, 7 counters available
>>> [ 0.291305] futex hash table entries: 1024 (order: 4, 65536 bytes)
>>> [ 0.292696] bounce: pool size: 64 pages
>>> [ 0.292746] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252)
>>> [ 0.292758] io scheduler noop registered
>>> [ 0.292766] io scheduler deadline registered
>>> [ 0.292779] io scheduler cfq registered (default)
>>> [ 0.293754] armada-xp-pinctrl f1018000.pin-ctrl: registered pinctrl driver
>>> [ 0.294186] irq: Cannot allocate irq_descs @ IRQ48, assuming pre-allocated
>>> [ 0.294451] irq: Cannot allocate irq_descs @ IRQ80, assuming pre-allocated
>>> [ 0.294612] irq: Cannot allocate irq_descs @ IRQ112, assuming pre-allocated
>>> [ 0.295033] mv_xor f1060900.xor: Marvell shared XOR driver
>>> [ 0.332873] mv_xor f1060900.xor: Marvell XOR (Registers Mode): ( xor cpy intr )
>>> [ 0.372848] mv_xor f1060900.xor: Marvell XOR (Registers Mode): ( xor cpy intr )
>>> [ 0.372958] mv_xor f10f0900.xor: Marvell shared XOR driver
>>> [ 0.412850] mv_xor f10f0900.xor: Marvell XOR (Registers Mode): ( xor cpy intr )
>>> [ 0.452845] mv_xor f10f0900.xor: Marvell XOR (Registers Mode): ( xor cpy intr )
>>> [ 0.492634] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
>>> [ 0.493897] console [ttyS0] disabled
>>> [ 0.514007] f1012000.serial: ttyS0 at MMIO 0xf1012000 (irq = 20, base_baud = 15625000) is a 16550A
>>> [ 1.200947] console [ttyS0] enabled
>>> [ 1.225041] f1012100.serial: ttyS1 at MMIO 0xf1012100 (irq = 21, base_baud = 15625000) is a 16550A
>>> [ 1.254648] f1012200.serial: ttyS2 at MMIO 0xf1012200 (irq = 33, base_baud = 15625000) is a 16550A
>>> [ 1.284237] f1012300.serial: ttyS3 at MMIO 0xf1012300 (irq = 34, base_baud = 15625000) is a 16550A
>>> [ 1.294303] sata_mv f10a0000.sata: slots 32 ports 2
>>> [ 1.300098] scsi host0: sata_mv
>>> [ 1.303511] scsi host1: sata_mv
>>> [ 1.306805] ata1: SATA max UDMA/133 irq 31
>>> [ 1.310913] ata2: SATA max UDMA/133 irq 31
>>> [ 1.315482] pxa3xx-nand f10d0000.nand: This platform can't do DMA on this device
>>> [ 1.323280] nand: device found, Manufacturer ID: 0x2c, Chip ID: 0x38
>>> [ 1.329650] nand: Micron MT29F8G08ABABAWP
>>> [ 1.333684] nand: 1024 MiB, SLC, erase size: 512 KiB, page size: 4096, OOB size: 224
>>> [ 1.341450] pxa3xx-nand f10d0000.nand: ECC strength 16, ECC step size 2048
>>> [ 1.349163] Bad block table found at page 261888, version 0x01
>>> [ 1.355385] Bad block table found at page 262016, version 0x01
>>> [ 1.364466] pxa3xx_nand-0: 'partitions' subnode not found on /soc/internal-regs/nand at d0000. Trying to parse direct subnodes as partitions.
>>> [ 1.378215] m25p80 spi0.0: n25q128a13 (16384 Kbytes)
>>> [ 1.385098] spi0.0: 'partitions' subnode not found on /soc/internal-regs/spi at 10600/spi-flash at 0. Trying to parse direct subnodes as partitions.
>>> [ 1.399136] libphy: Fixed MDIO Bus: probed
>>> [ 1.403396] libphy: orion_mdio_bus: probed
>>> [ 1.415856] mvneta_bm f10c0000.bm: Buffer Manager for network controller enabled
>>> [ 1.424232] size = 0x0, target = 0x0, attr = 0x1e
>>> [ 1.428949] mvebu_mbus: invalid dram address 0x2d194000
>>> [ 1.434204] mvneta_bm f10c0000.bm: fail to create pool 0
>>> [ 1.439532] mvneta f1070000.ethernet eth0: fail to obtain long pool for port
>>> [ 1.446607] mvneta f1070000.ethernet: use SW buffer management
>>> [ 1.452696] mvneta f1070000.ethernet eth0: Using hardware mac address 00:50:43:68:1c:28
>>> [ 1.461529] size = 0x0, target = 0x0, attr = 0x1e
>>> [ 1.466258] mvebu_mbus: invalid dram address 0x2d198000
>>> [ 1.471501] mvneta_bm f10c0000.bm: fail to create pool 1
>>> [ 1.476836] mvneta f1074000.ethernet eth1: fail to obtain long pool for port
>>> [ 1.483910] mvneta f1074000.ethernet: use SW buffer management
>>> [ 1.489994] mvneta f1074000.ethernet eth1: Using random mac address be:14:de:e2:be:cf
>>> [ 1.498661] size = 0x0, target = 0x0, attr = 0x1e
>>> [ 1.503391] mvebu_mbus: invalid dram address 0x2d10c000
>>> [ 1.508633] mvneta_bm f10c0000.bm: fail to create pool 2
>>> [ 1.513968] mvneta f1030000.ethernet eth2: fail to obtain long pool for port
>>> [ 1.521035] mvneta f1030000.ethernet: use SW buffer management
>>> [ 1.527121] mvneta f1030000.ethernet eth2: Using random mac address 86:3c:f8:02:31:cf
>>> [ 1.535810] size = 0x0, target = 0x0, attr = 0x1e
>>> [ 1.540527] mvebu_mbus: invalid dram address 0x2d752000
>>> [ 1.545781] mvneta_bm f10c0000.bm: fail to create pool 3
>>> [ 1.551108] mvneta f1034000.ethernet eth3: fail to obtain long pool for port
>>> [ 1.558182] mvneta f1034000.ethernet: use SW buffer management
>>> [ 1.564269] mvneta f1034000.ethernet eth3: Using random mac address 7e:3e:74:8c:93:50
>>> [ 1.572297] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
>>> [ 1.578863] ehci-pci: EHCI PCI platform driver
>>> [ 1.583371] ehci-orion: EHCI orion driver
>>> [ 1.587476] orion-ehci f1050000.usb: EHCI Host Controller
>>> [ 1.592916] orion-ehci f1050000.usb: new USB bus registered, assigned bus number 1
>>> [ 1.600567] orion-ehci f1050000.usb: irq 27, io mem 0xf1050000
>>> [ 1.622494] orion-ehci f1050000.usb: USB 2.0 started, EHCI 1.00
>>> [ 1.628967] hub 1-0:1.0: USB hub found
>>> [ 1.632806] hub 1-0:1.0: 1 port detected
>>> [ 1.637018] orion-ehci f1051000.usb: EHCI Host Controller
>>> [ 1.642468] orion-ehci f1051000.usb: new USB bus registered, assigned bus number 2
>>> [ 1.650111] orion-ehci f1051000.usb: irq 28, io mem 0xf1051000
>>> [ 1.672467] orion-ehci f1051000.usb: USB 2.0 started, EHCI 1.00
>>> [ 1.678908] hub 2-0:1.0: USB hub found
>>> [ 1.682736] hub 2-0:1.0: 1 port detected
>>> [ 1.687203] usbcore: registered new interface driver usb-storage
>>> [ 1.693454] mousedev: PS/2 mouse device common for all mice
>>> [ 1.699593] rtc-mv f1010300.rtc: rtc core: registered f1010300.rtc as rtc0
>>> [ 1.706641] i2c /dev entries driver
>>> [ 1.711074] orion_wdt: Initial timeout 171 sec
>>> [ 1.715770] cpu: dev_pm_opp_of_cpumask_add_table: couldn't find opp table for cpu:0, -19
>>> [ 1.723985] cpu: dev_pm_opp_of_cpumask_add_table: couldn't find opp table for cpu:1, -19
>>> [ 1.732174] cpu: dev_pm_opp_of_cpumask_add_table: couldn't find opp table for cpu:2, -19
>>> [ 1.740372] cpu: dev_pm_opp_of_cpumask_add_table: couldn't find opp table for cpu:3, -19
>>> [ 1.748968] sdhci: Secure Digital Host Controller Interface driver
>>> [ 1.755176] sdhci: Copyright(c) Pierre Ossman
>>> [ 1.759723] sdhci-pltfm: SDHCI platform and OF driver helper
>>> [ 1.765805] usbcore: registered new interface driver usbhid
>>> [ 1.771394] usbhid: USB HID core driver
>>> [ 1.775730] f0000000.nor: Found 1 x16 devices at 0x0 in 16-bit bank. Manufacturer ID 0x000089 Chip ID 0x000018
>>> [ 1.785775] Intel/Sharp Extended Query Table at 0x0031
>>> [ 1.790936] Intel/Sharp Extended Query Table at 0x0031
>>> [ 1.796106] Using buffer write method
>>> [ 1.799778] cfi_cmdset_0001: Erase suspend on write enabled
>>> [ 1.809269] f0000000.nor: 'partitions' subnode not found on /soc/devbus-bootcs/nor at 0. Trying to parse direct subnodes as partitions.
>>> [ 1.822513] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl F300)
>>> [ 1.829037] NET: Registered protocol family 10
>>> [ 1.834180] sit: IPv6 over IPv4 tunneling driver
>>> [ 1.839209] NET: Registered protocol family 17
>>> [ 1.842687] ata1.00: ATA-9: TS8GHSD310, 20111220, max UDMA/133
>>> [ 1.842692] ata1.00: 15621984 sectors, multi 1: LBA48 NCQ (depth 31/32)
>>> [ 1.856343] ThumbEE CPU extension supported.
>>> [ 1.860632] Registering SWP/SWPB emulation handler
>>> [ 1.862685] ata1.00: configured for UDMA/133
>>> [ 1.862993] scsi 0:0:0:0: Direct-Access ATA TS8GHSD310 1220 PQ: 0 ANSI: 5
>>> [ 1.863646] sd 0:0:0:0: [sda] 15621984 512-byte logical blocks: (7.99 GB/7.44 GiB)
>>> [ 1.863838] sd 0:0:0:0: [sda] Write Protect is off
>>> [ 1.863907] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
>>> [ 1.873801] sda: sda1 sda2 sda3 < sda5 > sda4
>>> [ 1.875389] sd 0:0:0:0: [sda] Attached SCSI disk
>>> [ 1.909334] rtc-mv f1010300.rtc: setting system clock to 2001-01-20 07:57:42 UTC (979977462)
>>> [ 1.918901] ALSA device list:
>>> [ 1.921878] No soundcards found.
>>> [ 2.222505] ata2: SATA link down (SStatus 0 SControl F300)
>>> [ 2.230484] Freeing unused kernel memory: 4460K (c06fd000 - c0b58000)
>>>
>>> --
>>> Gregory Clement, Free Electrons
>>> Kernel, drivers, real-time and embedded Linux
>>> development, consulting, training and support.
>>> http://free-electrons.com
>
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--
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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