From: Marcelo Tosatti <marcelo@conectiva.com.br>
To: Roger Larsson <roger.larsson@norran.net>
Cc: linux-mm@kvack.org
Subject: Re: mmap002 execution time doubled... good or bad sign?
Date: Sun, 11 Feb 2001 00:05:43 -0200 (BRST) [thread overview]
Message-ID: <Pine.LNX.4.21.0102110001130.27734-100000@freak.distro.conectiva> (raw)
In-Reply-To: <01021023231906.02374@dox>
On Sat, 10 Feb 2001, Roger Larsson wrote:
> Hi,
>
> I have been running various stress tests on disk for some time.
> streaming write, copy, read, diff, dbench and mmap002
>
> This is what I have seen:
>
> >From 2.4.0 to 2.4.1 with Marcelos patch write were above 10 MB/s
> and read >13 MB/s, dbench > 10 MB/s, mmap took around 2m30.
>
> After 2.4.1-pre8 (did not test anything in between)
> Write is at 9-10 [lost 1 MB/s] read is down to 11-12 MB/s [lost 2 MB/s]
> dbench > 9 MB/s [one MB/s there too]
>
> But the really strange one - mmap002 now takes > 4m30
> Is this expected / good behaviour? mmap002 abuses mmaps...
These are probably Jens modifications to the block queuing mechanisms
since there were no VM changes from 2.4.1-pre8 to now in Linus tree.
Its not necessarily a bad thing, since Jens modifications make processes
throttle on IO sooner.
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prev parent reply other threads:[~2001-02-11 2:05 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-02-10 22:23 Roger Larsson
2001-02-11 2:05 ` Marcelo Tosatti [this message]
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