From: Bruno Randolf <br1@einfach.org>
To: Bob Copeland <me@bobcopeland.com>
Cc: linux-wireless@vger.kernel.org, ath5k-devel@lists.ath5k.org,
johannes@sipsolutions.net
Subject: Re: [PATCH/RFC 3/3] ath5k: trace resets
Date: Wed, 21 Jul 2010 14:17:23 +0900 [thread overview]
Message-ID: <201007211417.23512.br1@einfach.org> (raw)
In-Reply-To: <20100721034150.GA16632@hash.localnet>
On Wed July 21 2010 12:41:50 Bob Copeland wrote:
> On Wed, Jul 21, 2010 at 10:04:59AM +0900, Bruno Randolf wrote:
> > the difference. without tracing you can get 22Mbps, with tracing max
> > 15Mbps UDP thruput.
>
> If so, and it's not an i-cache effect, then something is wrong with
> the tracing subsystem. It's supposed to compile to something like
>
> if (tracing) {
> trace_callback();
> }
>
> That is exactly what we have with the debug infrastructure, but
> the debug stuff is theoretically a bit worse since it tests for
> tracing inside the callback.
but that's for all tracepoints all over the kernel... i think it's natural
that this takes some CPU time. note that on these boards even the 22Mbps are
limited by the CPU processing power.
> Oh well, I guess I need to get my hands on one of these boards.
could be helpful, allthough i have to admit that these boards are getting old
and more current embedded boards usually do have faster CPUs...
bruno
next prev parent reply other threads:[~2010-07-21 5:15 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-17 19:35 [PATCH/RFC 0/3] ath5k: add driver tracepoints Bob Copeland
2010-07-17 19:35 ` [PATCH/RFC 1/3] ath5k: log descriptor chains at a new debug level Bob Copeland
2010-07-20 5:01 ` Bruno Randolf
2010-07-17 19:35 ` [PATCH/RFC 2/3] ath5k: use tracing for packet tx/rx dump Bob Copeland
2010-07-17 19:35 ` [PATCH/RFC 3/3] ath5k: trace resets Bob Copeland
2010-07-20 5:20 ` Bruno Randolf
2010-07-20 14:52 ` Bob Copeland
2010-07-21 1:04 ` Bruno Randolf
2010-07-21 1:12 ` [ath5k-devel] " Luis R. Rodriguez
2010-07-21 3:41 ` Bob Copeland
2010-07-21 5:17 ` Bruno Randolf [this message]
2010-07-21 5:46 ` Ben Gamari
2010-07-21 7:53 ` Johannes Berg
2010-07-22 9:21 ` Bruno Randolf
2010-07-20 5:11 ` [ath5k-devel] [PATCH/RFC 0/3] ath5k: add driver tracepoints Bruno Randolf
2010-07-20 7:54 ` Johannes Berg
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