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Re: pagebuf_prepare_write doesn't kmap the page

To: Andi Kleen <ak@xxxxxxx>
Subject: Re: pagebuf_prepare_write doesn't kmap the page
From: Jens Axboe <axboe@xxxxxxx>
Date: Wed, 31 Jan 2001 18:39:41 +0100
Cc: Steve Lord <lord@xxxxxxx>, Marcelo Tosatti <marcelo@xxxxxxxxxxxxxxxx>, linux-xfs@xxxxxxxxxxx
In-reply-to: <20010131183712.A31126@xxxxxxxxxxxxxxxxxxx>; from ak@xxxxxxx on Wed, Jan 31, 2001 at 06:37:12PM +0100
References: <lord@xxxxxxx> <200101311643.f0VGhgR26778@xxxxxxxxxxxxxxxxxxxx> <20010131183117.P508@xxxxxxx> <20010131183712.A31126@xxxxxxxxxxxxxxxxxxx>
Sender: owner-linux-xfs@xxxxxxxxxxx
On Wed, Jan 31 2001, Andi Kleen wrote:
> > Dbench being slower in 2.4.1 vs 2.4.0 would be quite normal, and
> > I wouldn't be alarmed if it's the only one disturbed by this. The
> > easy way to get screamer dbench numbers is to completely ignore
> > latency and finish one process I/O at the time only.
> This sounds like it would be interesting to modify dbench to log average
> running times for individual processes. Then such latency changes could
> be catched.

Indeed, this would make it an even better disk benchmark.

Jens Axboe

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