| To: | Petru Paler <ppetru@xxxxxxxxxx> |
|---|---|
| Subject: | Re: Effect of kiobufs? |
| From: | Jens Axboe <axboe@xxxxxxx> |
| Date: | Sat, 24 Mar 2001 12:31:18 +0100 |
| Cc: | linux-xfs@xxxxxxxxxxx |
| In-reply-to: | <20010324131336.A3369@ppetru.net>; from ppetru@ppetru.net on Sat, Mar 24, 2001 at 01:13:36PM +0200 |
| References: | <20010324131336.A3369@ppetru.net> |
| Sender: | owner-linux-xfs@xxxxxxxxxxx |
On Sat, Mar 24 2001, Petru Paler wrote: > Hi, > > What are the gains of using the "kio" mount options? Are > kiobufs faster than buffer heads, or they just allow more > efficient merging of requests? The kiobufs allow efficient "merging" from the fs side, so that it can submit single large chunks of I/O. The gains can be pretty good, I know Steve Lord had some numbers on IDE and SCSI bh vs kiobuf that showed this nicely. -- Jens Axboe |
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