From: Cesar <caesargo@163.com>
To: ath9k-devel@lists.ath9k.org
Subject: [ath9k-devel] ath9k monitor mode injection packet delay
Date: Wed, 29 Jun 2016 10:05:09 +0800 (CST) [thread overview]
Message-ID: <6d0f8803.398a.15599e721ba.Coremail.caesargo@163.com> (raw)
In-Reply-To: <CAJ-VmonBvLJgXBRVEgt2dOX5OsgL-nPZM1A4n4YmbthDkkxHUw@mail.gmail.com>
Dear Adrian Chadd,
Thanks for your reply. It's correct that USB may introduce some delays, but in our experiment we use mini-pcie devices indeed...
Cesar
At 2016-06-29 04:05:32, "Adrian Chadd" <adrian@freebsd.org> wrote:
>Hi,
>
>can you try this using pci/pcie devices instead of USB? There may be
>USB scheduling things in the way.
>
>On 27 June 2016 at 20:55, Cesar <caesargo@163.com> wrote:
>> Hello all,
>> We?ve recently tried to test packet injection performace in ath9k monitor
>> mode. We set 2 laptops in monitor mode , PC 1 send a 500 Byte packets out,
>> and PC 2 return a 500 Bytes packet back at once when it receives the packet
>> of PC 1. Then we measured the RTT time and found it's about 1000us !!!
>>
>> Test environment:
>> NIC: AR9287
>> driver: ath9k
>> system: ubuntu 14.04 with kernel 3.14.57
>> send rate : at a fixed rate 54Mb
>>
>>
>> We tried to send packets as "low" as possible in driver stack, and we're
>> sure that we disabled the CCA and backoff using flags below:
>>
>> AR_DIAG_FORCE_CH_IDLE_HIGH
>> AR_DIAG_IGNORE_VIRT_CS
>> AR_D_GBL_IFS_MISC_IGNORE_BACKOFF
>>
>> besides we change the aifs to 1 and cwmin cwmax to 0 in ath_txq_setup to
>> ensure there's no backoff. we even put our laptaps to a underground garage
>> where channel is almost clean.But the test results is still about 1000us....
>>
>> We've been stucked for serveral months, Any suggestion?
>> Any feedback welcome...
>> Thnkz in advance!!!
>>
>> Cesar
>>
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>> ath9k-devel mailing list
>> ath9k-devel at lists.ath9k.org
>> https://lists.ath9k.org/mailman/listinfo/ath9k-devel
>>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.ath9k.org/pipermail/ath9k-devel/attachments/20160629/b9bab7a5/attachment.htm
next prev parent reply other threads:[~2016-06-29 2:05 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-28 3:55 [ath9k-devel] ath9k monitor mode injection packet delay Cesar
2016-06-28 20:05 ` Adrian Chadd
2016-06-29 2:05 ` Cesar [this message]
2016-06-29 2:46 ` Adrian Chadd
2016-07-05 11:24 ` Cesar
2016-07-06 15:18 ` Adrian Chadd
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=6d0f8803.398a.15599e721ba.Coremail.caesargo@163.com \
--to=caesargo@163.com \
--cc=ath9k-devel@lists.ath9k.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).