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Re: [dm-devel] [Lsf-pc] [LSF/MM TOPIC] a few storage topics
- From: "Loke, Chetan" <Chetan Loke netscout com>
- To: "Steven Whitehouse" <swhiteho redhat com>, "Andreas Dilger" <adilger dilger ca>
- Cc: Andrea Arcangeli <aarcange redhat com>, Jan Kara <jack suse cz>, linux-scsi vger kernel org, Mike Snitzer <snitzer redhat com>, dm-devel redhat com, Christoph Hellwig <hch infradead org>, Jeff Moyer <jmoyer redhat com>, Wu Fengguang <fengguang wu gmail com>, Boaz Harrosh <bharrosh panasas com>, linux-fsdevel vger kernel org, lsf-pc lists linux-foundation org, Chris Mason <chris mason oracle com>
- Subject: Re: [dm-devel] [Lsf-pc] [LSF/MM TOPIC] a few storage topics
- Date: Wed, 25 Jan 2012 11:22:01 -0500
> If the reason for not setting a larger readahead value is just that it
> might increase memory pressure and thus decrease performance, is it
> possible to use a suitable metric from the VM in order to set the value
> automatically according to circumstances?
>
How about tracking heuristics for 'read-hits from previous read-aheads'? If the hits are in acceptable range(user-configurable knob?) then keep seeking else back-off a little on the read-ahead?
> Steve.
Chetan Loke
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