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Re: pagebuf_prepare_write doesn't kmap the page

To: Jens Axboe <axboe@xxxxxxx>
Subject: Re: pagebuf_prepare_write doesn't kmap the page
From: Andi Kleen <ak@xxxxxxx>
Date: Wed, 31 Jan 2001 18:37:12 +0100
Cc: Steve Lord <lord@xxxxxxx>, Marcelo Tosatti <marcelo@xxxxxxxxxxxxxxxx>, linux-xfs@xxxxxxxxxxx
In-reply-to: <20010131183117.P508@xxxxxxx>; from axboe@xxxxxxx on Wed, Jan 31, 2001 at 06:31:17PM +0100
References: <lord@xxxxxxx> <200101311643.f0VGhgR26778@xxxxxxxxxxxxxxxxxxxx> <20010131183117.P508@xxxxxxx>
Sender: owner-linux-xfs@xxxxxxxxxxx
User-agent: Mutt/1.2.5i
On Wed, Jan 31, 2001 at 06:31:17PM +0100, Jens Axboe wrote:
> On Wed, Jan 31 2001, Steve Lord wrote:
> > 
> > To follow up on my own message - running some micro benchmarks, every single
> > individual operation got faster, but dbench got slower.....
> 
> 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.


-Andi

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