[OpenWrt-Devel] ar71xx with kernel 4.14 - a few test results

[Chuanhong Guo]

Hi!
Tom Psyborg <pozega.tomislav at gmail.com> 于2018年8月23日周四 下午8:36写道：
>
> Hi Dirk
>
> You say: "works quite fine, both radios are available,
>  no issues at all"
>
> but no feedback on how it actually performs...
>
> From my test I got throughput of 215Mbps on 2.4GHz wifi with 4.9
> After upgraded to 4.14 the throughput dropped to 185-190Mbps. same
> device same settings and testing conditions.
I personally think the performance is expected to be slightly worse
because the newer kernel is bigger and more complicated.
Qualcomm Atheros addressed some performance loss in their QSDK5.3
release manual as "Limitations" where in this version they upgraded
kernel from 3.14 to 4.4. And I experienced a significant decreasing in
Samba writing speed on IPQ4019 after this kernel bump in QSDK.
There are other shortcomings along with upgraded kernel e.g. the
kernel is getting so big that we may not be able to use 4M flash with
even just basic functions of a router in a near future.
(I remember that someone successfully fit USB support and Samba into
4M flash using OpenWrt Backfire 10.04 and back to those days there are
some routers running Linux with only 16M ram.)
I guess the reason why OpenWrt still keeps bumping kernels is that
it's not realistic to maintain so many kernel versions forever. My
suggestion is that if you really care so much about the performance
loss caused by bumping kernels you can just keep using an older stable
release.

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