From: Stephen Hemminger <shemminger@linux-foundation.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Maximilian Engelhardt <maxi@daemonizer.de>,
Michael Buesch <mb@bu3sch.de>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-wireless <linux-wireless@vger.kernel.org>,
Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
Jeff Garzik <jgarzik@pobox.com>,
Gary Zambrano <zambrano@broadcom.com>,
netdev@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>
Subject: Re: b44: regression in 2.6.22 (resend)
Date: Mon, 4 Jun 2007 09:09:18 -0700 [thread overview]
Message-ID: <20070604090918.42386fbb@freepuppy> (raw)
In-Reply-To: <1180939188.4404.5.camel@chaos>
On Mon, 04 Jun 2007 08:39:48 +0200
Thomas Gleixner <tglx@linutronix.de> wrote:
> On Sun, 2007-06-03 at 18:26 +0200, Maximilian Engelhardt wrote:
> > > Is there any other strange behavior of the high res enabled kernel than
> > > the b44 problem ?
> >
> > I didn't notice anything in the past (as I wrote). But today I did some tests
> > for an updated version of the p54 mac80211 wlan driver and I noticed exactly
> > the same problem:
> >
> > when booting with highres=off everything is fine.
> > But when I boot an highres enabled kernel and I do the iperf-test with the p54
> > driver, my systems becomes unresponsive during the test. It seems to be
> > exactly the same problem I have with the b44 driver.
> > So this might not be a bug in the b44 code but a bug somewhere in the linux
> > networking code.
> >
> > I did the test with an 2.6.22-rc3-git4 kernel and the p54 driver built
> > external as module.
>
> Can you look at iperf to figure out, whether it does some weird timer
> stuff (high frequency interval timer or such) ? Either check the code or
> strace it.
>
> tglx
>
>
It is the receiver doing a tight loop doing gettimeofday/recv calls.
sendto(-1227715616, 0xc, 3085438964, 0, {...}, 3067249832) = 0
gettimeofday({1180973726, 981615}, NULL) = 0
gettimeofday({1180973726, 981751}, NULL) = 0
futex(0x8055c64, 0x5 /* FUTEX_??? */, 1) = 1
futex(0x8055c90, FUTEX_WAKE, 1) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 982754}, NULL) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 983790}, NULL) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 984355}, NULL) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 984706}, NULL) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 985111}, NULL) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 985499}, NULL) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 986088}, NULL) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 986436}, NULL) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 986916}, NULL) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 987397}, NULL) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 987872}, NULL) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 988440}, NULL) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 988823}, NULL) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 989314}, NULL) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 990029}, NULL) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 990890}, NULL) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 991803}, NULL) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 992616}, NULL) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 993105}, NULL) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 993585}, NULL) = 0
recv(4, "\0\0\0\0\0\0\0\1\0\0\23\211\0\0\0\0\0\0\0\0\377\377\364"..., 8192, 0) = 8192
gettimeofday({1180973726, 994014}, NULL) = 0
...
recv(4, "45678901234567890123456789012345"..., 8192, 0) = 1448
gettimeofday({1180973757, 172437}, NULL) = 0
recv(4, "23456789012345678901234567890123"..., 8192, 0) = 1448
gettimeofday({1180973757, 172576}, NULL) = 0
recv(4, "01234567890123456789012345678901"..., 8192, 0) = 1632
gettimeofday({1180973757, 172752}, NULL) = 0
recv(4, "", 8192, 0) = 0
gettimeofday({1180973757, 172797}, NULL) = 0
gettimeofday({1180973757, 172817}, NULL) = 0
nanosleep({0, 0}, NULL) = 0
nanosleep({0, 0}, NULL) = 0
close(4) = 0
futex(0x8055d04, 0x5 /* FUTEX_??? */, 1) = 1
futex(0x8055d30, FUTEX_WAKE, 1) = 0
_exit(0)
--
Stephen Hemminger <shemminger@linux-foundation.org>
next prev parent reply other threads:[~2007-06-04 16:22 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20070525172431.60affaca@freepuppy>
[not found] ` <200705261901.18110.mb@bu3sch.de>
2007-05-27 19:25 ` b44: regression in 2.6.22 (resend) Maximilian Engelhardt
2007-05-27 19:45 ` Michael Buesch
2007-05-27 20:36 ` Maximilian Engelhardt
2007-05-27 20:46 ` Michael Buesch
2007-05-27 21:46 ` Maximilian Engelhardt
2007-05-27 21:13 ` Michael Buesch
2007-05-27 21:16 ` Michael Buesch
2007-05-27 21:50 ` Maximilian Engelhardt
2007-05-27 22:15 ` Maximilian Engelhardt
2007-05-28 0:24 ` Michael Buesch
2007-05-28 0:40 ` Maximilian Engelhardt
2007-05-28 10:16 ` Michael Buesch
2007-05-28 14:09 ` Maximilian Engelhardt
2007-05-28 15:14 ` Michael Buesch
2007-05-28 15:32 ` Thomas Gleixner
2007-05-28 15:43 ` Michael Buesch
2007-05-28 17:44 ` Maximilian Engelhardt
2007-05-28 19:23 ` Thomas Gleixner
2007-05-28 20:55 ` Maximilian Engelhardt
2007-05-28 21:45 ` Thomas Gleixner
2007-05-29 18:28 ` Maximilian Engelhardt
2007-05-29 13:58 ` Gary Zambrano
2007-05-29 17:23 ` Maximilian Engelhardt
2007-06-03 16:26 ` Maximilian Engelhardt
2007-06-04 6:39 ` Thomas Gleixner
2007-06-04 16:09 ` Stephen Hemminger [this message]
2007-06-04 16:35 ` Thomas Gleixner
2007-06-04 16:59 ` iperf: performance regression (was b44 driver problem?) Stephen Hemminger
2007-06-04 17:32 ` Thomas Gleixner
2007-06-04 17:51 ` Stephen Hemminger
2007-06-04 19:00 ` Thomas Gleixner
2007-06-04 19:26 ` Thomas Gleixner
2007-06-04 19:32 ` Ingo Molnar
2007-06-04 19:47 ` Maximilian Engelhardt
2007-06-04 20:02 ` Stephen Hemminger
2007-06-04 20:52 ` Maximilian Engelhardt
2007-05-28 10:49 ` b44: regression in 2.6.22 (resend) Michael Buesch
2007-05-28 14:12 ` Maximilian Engelhardt
2007-05-28 14:55 ` Michael Buesch
2007-05-29 14:14 ` Gary Zambrano
2007-05-29 20:45 ` Michael Buesch
2007-05-29 21:01 ` Stephen Hemminger
2007-05-29 21:05 ` Gary Zambrano
2007-05-29 22:39 ` Jeff Garzik
2007-05-29 21:36 ` Gary Zambrano
2007-05-30 10:45 ` Michael Buesch
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