From: Kenneth Johansson <ken@kenjo.org>
To: Scott A Crosby <scrosby@cs.rice.edu>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Sluggishness in 2.6.7 caused by IDE stack
Date: Sun, 03 Oct 2004 01:00:06 +0200 [thread overview]
Message-ID: <1096758006.3287.7.camel@tiger> (raw)
In-Reply-To: <1096121485.2760.5.camel@tiger>
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On Sat, 2004-09-25 at 16:11 +0200, Kenneth Johansson wrote:
> On Sat, 2004-09-25 at 07:26 -0500, Scott A Crosby wrote:
> > Much of the CPU time was spent in system mode. I setup a quick
> > oprofile, which blamed the function task_no_data_intr, but an
> > opannotate reports confusing results, possibly from interrupts? dmesg
> > reported nothing interesting.
> >
> >
> > Scott
> >
> >
> > *** vmstat output ***
> >
> > procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
> > 1 1 410496 8520 14224 1253716 0 0 2180 16 409 633 10 43 0 48
> > 7 1 410496 6920 14236 1255380 0 0 1668 20 589 832 9 18 0 73
> > 3 0 410496 8264 14232 1253988 0 0 2436 80 334 438 18 82 0 0
> > 0 1 410496 8384 14244 1253860 0 0 1932 0 464 706 13 35 0 52
> > 5 1 410496 8056 14264 1253872 328 0 2280 0 717 965 14 20 0 65
> > 8 1 410496 7352 14268 1254640 0 0 2692 0 351 485 17 83 0 0
> > 2 2 410496 6968 14264 1255036 32 0 2336 0 332 522 17 83 0 0
> > 5 0 410496 8568 14276 1253384 0 0 2192 12 464 794 19 33 0 48
>
> I think you have the same problem as me. The interrupt rate drops under
> 1000 during use of the DVD and that is strange as the HZ is 1000 and
> that should be the lowest possible value unless I misunderstood
> something.
I did some more testing and it turns out that I was not using the via
IDE driver but some generic code. I had the IDE driver as a module and
it was loaded but it did only drive the two unused ports the generic
driver had control over the DVD drive. I removed CONFIG_IDE_GENERIC and
compiled the via driver into the kernel and everything work OK now.
I wonder why the generic code blocks interrupts but now I'm not that
interested in this problem anymore :)
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prev parent reply other threads:[~2004-10-02 23:00 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-25 12:26 Sluggishness in 2.6.7 caused by IDE stack Scott A Crosby
2004-09-25 14:11 ` Kenneth Johansson
2004-10-02 23:00 ` Kenneth Johansson [this message]
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