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From: Duncan Sands <baldrick@wanadoo.fr>
To: zlatko.calusic@iskon.hr,
	Alessandro Suardi <alessandro.suardi@oracle.com>
Cc: Hugh Dickins <hugh@veritas.com>, Andrew Morton <akpm@digeo.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Re: Shared memory shmat/dt not working well in 2.5.x
Date: Tue, 8 Oct 2002 13:38:50 +0200	[thread overview]
Message-ID: <200210081338.50495.baldrick@wanadoo.fr> (raw)
In-Reply-To: <87ptulcgzc.fsf@atlas.iskon.hr>

> I also observed that other application I use occasionally - LXR (Linux
> source cross referencing tool) - takes much longer to generate xref
> database (which is in Berkeley DB files). It works in three passes,
> where the last one, when it dumps symbols into DB, is interesting. In
> 2.4 it finishes quickly (it uses 100% CPU, then occasionally syncs the
> databases - heavy write traffic for a second - then continues), but
> 2.5 has problems with it (it stucks writing to disk all the time, CPU
> usage is minimal and process progresses very slowly). Andrew, if
> you're interested I can send you some numbers to describe the case
> better.

Hmmm, are you using ext3?  Changes to the meaning of yield sometimes
make fsync go very slowly.  This problem has been around since 2.5.28,
and hasn't yet been fixed (As for a fix, Andrew Morton said "I'll sit tight for
the while, see where shed_yield() behaviour ends up").

All the best,

Duncan.

  reply	other threads:[~2002-10-08 11:33 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-10-01  9:52 Shared memory shmat/dt not working well in 2.5.x Zlatko Calusic
2002-10-01 13:07 ` Alessandro Suardi
2002-10-01 13:09 ` [PATCH] " Hugh Dickins
2002-10-01 13:28   ` Alessandro Suardi
2002-10-01 13:46     ` Zlatko Calusic
2002-10-01 14:51       ` Alessandro Suardi
2002-10-01 14:59         ` Zlatko Calusic
2002-10-02 18:45         ` Zlatko Calusic
2002-10-08 11:22           ` Zlatko Calusic
2002-10-08 11:38             ` Duncan Sands [this message]
2002-10-08 15:10               ` Zlatko Calusic
2002-10-08 15:25                 ` Duncan Sands
2002-10-01 13:37   ` Zlatko Calusic
2002-10-01 15:32 ` [PATCH] Oracle startup split_vma fix Hugh Dickins

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