Messages in this thread | | | Date | Fri, 21 May 2004 01:56:47 -0700 | From | Andrew Morton <> | Subject | Spam: Re: Random file I/O regressions in 2.6 [patch+results] |
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Jens Axboe <axboe@suse.de> wrote: > > I think that's pretty similar. Andrew didn't say what device he was > testing on, but 2.4 ide defaults to max 64k where 2.6 defaults to 128k.
IDE.
I was being silly, sorry. Those I/O stats include the (huge linear) initial write of the "database" files, so the larger IDE request size will be dominating.
What I need is a way of getting sysbench to create and remove the database files in separate invokations, but the syntax for that is defeating me at present.
> > I'll take a guess at b, and say it could be as-iosched.c. > > Another thing might be that 2.6 has smaller nr_requests than > > 2.4, although you are unlikely to hid the read side limit > > with only 16 threads if they are doing sync IO. > > Andrew, you did numbers for deadline previously as well, but no rq > statistics there? As for nr_requests that's true, would be worth a shot > to bump available requests in 2.6.
Doubling the request queue size makes no difference. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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