From: Roy Sigurd Karlsbakk <roy@karlsbakk.net>
To: Andrew Morton <akpm@zip.com.au>
Cc: "Martin J. Bligh" <Martin.Bligh@us.ibm.com>,
linux-kernel@vger.kernel.org
Subject: Re: [2.4 BUFFERING BUG] (was [BUG] 2.4 VM sucks. Again)
Date: Wed, 10 Jul 2002 10:14:05 +0200 [thread overview]
Message-ID: <200207101014.05059.roy@karlsbakk.net> (raw)
In-Reply-To: <3D2BEAD9.6D7E62C1@zip.com.au>
On Wednesday 10 July 2002 10:05, Andrew Morton wrote:
> Roy Sigurd Karlsbakk wrote:
> > hi
> >
> > I've been using the patch below from Andrew for some weeks now, sometimes
> > under quite heavy load, and find it quite stable.
>
> Wish we knew why. I've tried many times to reproduce the problem
> which you're seeing. With just two gigs of memory, buffer_heads
> really cannot explain anything. It's weird.
well - firstly, I'm using _1_ gig of memory - highmem (= 900 megs something)
secondly - I have reproduced it on two different installations, although on
the same hardware - standard PC with SiS MB and an extra promise controller,
RAID-0 on 4 drives and chunksize 1MB. Given a 30-50 processes each reading a
4gig file and sending it over HTTP, everything works fine _if_ and only _if_
the client reads at high speed. If, however, the client reads at normal
streaming speed (4,3Mbps), buffers go bOOM.
> We discussed this in Ottawa - I guess Andrea will add the toss-the-buffers
> code on the read side (basically the filemap.c stuff). That may
> be sufficient, but without an understanding of what is going on,
> it is hard to predict.
Is there _any_ more data I can give, or any more testing I can do, then I'll
do my very best to help
roy
--
Roy Sigurd Karlsbakk, Datavaktmester
Computers are like air conditioners.
They stop working when you open Windows.
next prev parent reply other threads:[~2002-07-10 8:11 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-05-23 13:11 [BUG] 2.4 VM sucks. Again Roy Sigurd Karlsbakk
2002-05-23 14:54 ` Martin J. Bligh
2002-05-23 16:29 ` Roy Sigurd Karlsbakk
2002-05-23 16:46 ` Martin J. Bligh
2002-05-24 10:04 ` Roy Sigurd Karlsbakk
2002-05-24 14:35 ` Martin J. Bligh
2002-05-24 19:32 ` Andrew Morton
2002-05-30 10:29 ` Roy Sigurd Karlsbakk
2002-05-30 19:28 ` Andrew Morton
2002-05-31 16:56 ` Roy Sigurd Karlsbakk
2002-05-31 18:19 ` Andrea Arcangeli
2002-06-18 11:26 ` Roy Sigurd Karlsbakk
2002-06-18 19:42 ` Andrew Morton
2002-06-19 11:26 ` Roy Sigurd Karlsbakk
2002-07-10 7:50 ` [2.4 BUFFERING BUG] (was [BUG] 2.4 VM sucks. Again) Roy Sigurd Karlsbakk
2002-07-10 8:05 ` Andrew Morton
2002-07-10 8:14 ` Roy Sigurd Karlsbakk [this message]
2002-08-28 9:28 ` [BUG+FIX] 2.4 buggercache sucks Roy Sigurd Karlsbakk
2002-08-28 15:30 ` Martin J. Bligh
2002-08-29 8:00 ` Roy Sigurd Karlsbakk
2002-08-29 13:42 ` Martin J. Bligh
2002-08-30 9:21 ` Roy Sigurd Karlsbakk
2002-08-30 17:19 ` Martin J. Bligh
2002-08-30 18:49 ` Andrew Morton
2002-05-24 15:11 ` [BUG] 2.4 VM sucks. Again Alan Cox
2002-05-24 15:53 ` Martin J. Bligh
2002-05-24 16:14 ` Alan Cox
2002-05-24 16:31 ` Martin J. Bligh
2002-05-24 17:30 ` Austin Gonyou
2002-05-24 17:43 ` Martin J. Bligh
2002-05-24 18:03 ` Austin Gonyou
2002-05-24 18:10 ` Martin J. Bligh
2002-05-24 18:29 ` 2.4 Kernel Perf discussion [Was Re: [BUG] 2.4 VM sucks. Again] Austin Gonyou
2002-05-24 19:01 ` Stephen Frost
2002-05-27 9:24 ` [BUG] 2.4 VM sucks. Again Marco Colombo
2002-05-27 22:24 ` Austin Gonyou
2002-05-27 23:08 ` Austin Gonyou
2002-05-27 11:12 ` Roy Sigurd Karlsbakk
2002-05-27 14:31 ` Alan Cox
2002-05-27 13:43 ` Roy Sigurd Karlsbakk
2002-05-23 16:03 ` Johannes Erdfelt
2002-05-23 16:33 ` Roy Sigurd Karlsbakk
2002-05-23 22:50 ` Luigi Genoni
2002-05-24 11:53 ` Roy Sigurd Karlsbakk
2002-05-23 18:12 ` jlnance
2002-05-24 10:36 ` Roy Sigurd Karlsbakk
2002-05-31 21:21 ` Andrea Arcangeli
2002-06-01 12:36 ` Roy Sigurd Karlsbakk
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