Messages in this thread | | | Date | Tue, 15 Jul 2003 12:03:57 +0200 | From | Andrea Arcangeli <> | Subject | Re: RFC on io-stalls patch |
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On Tue, Jul 15, 2003 at 11:18:38AM +0200, Jens Axboe wrote: > On Tue, Jul 15 2003, Jens Axboe wrote: > > > BTW, the contest run times vary pretty wildy. My 3 compiles with > > > io_load running on 2.4.21 were 603s, 443s and 515s. This doesn't make > > > the average of the 3 numbers invalid, but we need a more stable metric. > > > > Mine are pretty consistent [1], I'd suspect that it isn't contest but your > > drive tcq skewing things. But it would be nice to test with other things > > as well, I just used contest because it was at hand. > > Oh and in the same spirit, I'll do the complete runs on an IDE drive as > well. Sometimes IDE vs SCSI shows the funniest things.
this is the first suspect IMHO too. Especially given the way that SCSI releases the requests.
One more thing: unlike my patch where I forced all drivers to support elevator-lowlatency (either that or not compile at all), Chris made it optional when he pushed it into mainline, so now the device driver has to call blk_queue_throttle_sectors(q, 1) to enable it. Otherwise it'll run like 2.4.21.
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