linux-kernel - Re: [PATCH 2/2] cfq: allow dispatching of both sync and async I/O together

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Date:	Tue, 22 Jun 2010 10:27:52 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] cfq: allow dispatching of both sync and async I/O together

Vivek Goyal <vgoyal@...hat.com> writes:

> On Tue, Jun 22, 2010 at 08:45:54AM -0400, Jeff Moyer wrote:
>> Vivek Goyal <vgoyal@...hat.com> writes:
>> 
>> > On Mon, Jun 21, 2010 at 07:22:08PM -0400, Vivek Goyal wrote:
>> > So looks like firefox launching times have not changed much in the presence
>> > of heavy buffered writting going on root disk. I will do more testing tomorrow.
>> 
>> Was the buffered writer actually hitting disk?  How much memory is on
>> your system?
>
> I have 4G of memory in the system. I used to wait for 10-15 seconds after
> writer has started and then launch firefox to make sure writes are actually
> hitting the disk.
>
> Are you seeing different results in your testing?

No, I hadn't got to testing this yet.  I was just making sure the test
procedure was sane (and it is).  Thanks for doing the testing!

-Jeff
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