Packet loss/errors/delays.

Justin hostap
Thu Sep 13 00:43:41 PDT 2012


I have been pulling my hair out with issues with HostAP, and I cannot seem to
get my head around it.  I'm hoping someone can point me in the right

Here's the situation:

I have a Linksys WRT320n running OpenWRT I am trying to take out of service in
favour of a mini-ITX box I've built.  The WRT320n works nicely, but its
throughput stinks.  My Internet connection is 75Mbps, but it can't handle >

With the WRT320n, a ping from my desktop to the router takes ~1ms pretty
consistently.. there's a little deviance occasionally, but never more than

With HostAP, it jumps all over the place.  I experience 5-10% packet loss,
sometimes receive DUP packets, and the ping times range from 5-6ms all the way
up to 8-900ms.  I don't know what series of events I do that cause it, but
sometimes packet latency approaches 3000-4000ms, and loss up to 30%.

The card I'm using is an Atheros AR9285 mini pci-e adapter.  At first I
thought it might be the adapter's fault, so I bought a Broadcom BCM4321 and
suffered the exact same issues.

I am running Gentoo and have tried hostapd 0.7.3, hostapd 1.0-r1, and the
current git as of today.  All have the same outcome.

To try and narrow down the issue, I have cut my hostapd.conf file to contain


I've tried changing channels, too (although that's the channel the wrt320n
operates on.)

Any device can see and connect to the AP just fine, but the latency and
connection stability is a mess.

What's equally puzzling is that throughput is stellar; I can transfer very
quickly.  Except when the packet loss inevitably goes up to 30% and latency
starts to get into multiple seconds.  And ssh connections never make it
through the night or go without long pauses/disconnects.

hostapd with -dd doesn't return anything particularly useful, but I haven't
been able to make sense of which logging commands and which log levels will
output anything useful.

If I use the ar9285 in that box as a wireless client with wpa_supplicant, it
works flawlessly; ping times that are sub-1ms, and 0% packet loss.

I'm hoping someone here can point me in the right direction for debugging
and/or making sense of this.



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