From: Ben Greear <greearb@candelatech.com>
To: "Björn Smedman" <bjorn.smedman@venatech.se>
Cc: "Luis R. Rodriguez" <lrodriguez@atheros.com>,
Felix Fietkau <nbd@openwrt.org>,
Luis Rodriguez <Luis.Rodriguez@atheros.com>,
"ath9k-devel@lists.ath9k.org" <ath9k-devel@venema.h4ckr.net>,
"linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>
Subject: Re: [ath9k-devel] Script to crash ath9k with DMA errors.
Date: Mon, 06 Dec 2010 12:22:26 -0800 [thread overview]
Message-ID: <4CFD4602.1030304@candelatech.com> (raw)
In-Reply-To: <AANLkTingy7fPH14hW_mg8_YcotX29pYCu910Gw48grrD@mail.gmail.com>
On 12/06/2010 12:11 PM, Björn Smedman wrote:
> On Mon, Dec 6, 2010 at 8:47 PM, Ben Greear<greearb@candelatech.com> wrote:
>> With 16 properly configured non-encrypted stations, running with
>> wpa-supplicant
>> with netlink driver& sharing scan results, the interfaces quickly
>> associate.
>>
>> However, I do continue to see DMA warnings such as these (I had picked up my
>> portable phone, and it knocked all the interfaces offline ..here
>> they are coming back up after I hung up the phone).
>
> Is there some theory as to why using multiple interfaces cause so many
> problems with DMA?
Seems pretty directly related to channel changes and/or resets, and exacerbated
by other interfaces sending data while another is scanning, for instance.
Other issues we've found in the past have been various races that you wouldn't
normally see with a single VIF.
Thanks,
Ben
>
> /Björn
--
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc http://www.candelatech.com
next prev parent reply other threads:[~2010-12-06 20:22 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-30 0:28 Script to crash ath9k with DMA errors Ben Greear
2010-11-30 0:44 ` [ath9k-devel] " Luis R. Rodriguez
2010-11-30 0:52 ` Ben Greear
2010-12-01 23:22 ` Ben Greear
2010-12-03 8:14 ` Ben Greear
2010-12-05 2:41 ` Felix Fietkau
2010-12-05 3:30 ` Ben Greear
2010-12-05 5:18 ` Ben Greear
2010-12-06 19:36 ` Luis R. Rodriguez
2010-12-06 19:47 ` Ben Greear
2010-12-06 19:53 ` Luis R. Rodriguez
2010-12-06 19:53 ` Luis R. Rodriguez
2010-12-06 20:28 ` Ben Greear
2010-12-06 20:38 ` Felix Fietkau
2010-12-06 20:11 ` Björn Smedman
2010-12-06 20:22 ` Ben Greear [this message]
2010-12-06 20:42 ` Luis R. Rodriguez
2010-12-06 21:00 ` Ben Greear
2010-12-06 21:16 ` Luis R. Rodriguez
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