Messages in this thread | | | Date | Fri, 10 Jul 2009 13:27:29 +0400 | From | Vladislav Bolkhovitin <> | Subject | Re: [RESEND] [PATCH] readahead:add blk_run_backing_dev |
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Vladislav Bolkhovitin, on 07/10/2009 12:43 PM wrote: > Ronald Moesbergen, on 07/10/2009 10:32 AM wrote: >>> I've also long ago noticed that reading data from block devices is slower >>> than from files from mounted on those block devices file systems. Can >>> anybody explain it? >>> >>> Looks like this is strangeness #2 which we uncovered in our tests (the first >>> one was earlier in this thread why the context RA doesn't work with >>> cooperative I/O threads as good as it should). >>> >>> Can you rerun the same 11 tests over a file on the file system, please? >> I'll see what I can do. Just te be sure: you want me to run >> blockdev-perftest on a file on the OCFS2 filesystem which is mounted >> on the client over iScsi, right? > > Yes, please.
Forgot to mention that you should also configure your backend storage as a big file on a file system (preferably, XFS) too, not as direct device, like /dev/vg/db-master.
Thanks, Vlad
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