From: Adrian Chadd <adrian@freebsd.org>
To: ath9k-devel@lists.ath9k.org
Subject: [ath9k-devel] ath9k monitor mode injection packet delay
Date: Tue, 28 Jun 2016 13:05:32 -0700 [thread overview]
Message-ID: <CAJ-VmonBvLJgXBRVEgt2dOX5OsgL-nPZM1A4n4YmbthDkkxHUw@mail.gmail.com> (raw)
In-Reply-To: <6e91ed7f.6af3.15595258d46.Coremail.caesargo@163.com>
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 prev parent reply other threads:[~2016-06-28 20:05 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 [this message]
2016-06-29 2:05 ` Cesar
2016-06-29 2:46 ` Adrian Chadd
2016-07-05 11:24 ` Cesar
2016-07-06 15:18 ` Adrian Chadd
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