Messages in this thread | | | Date | Tue, 2 Jan 2007 18:09:17 +0100 (MET) | From | Jan Engelhardt <> | Subject | Re: 2.6.20-rc2+: CFQ halving disk throughput. |
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On Jan 2 2007 10:01, Mark Lord wrote: > Jens Axboe wrote: >> >> > But surely one of (not sure which) sync+async or async+sync may also >> > be okay? >> > Or would it? >> >> Async merge to sync request should be ok. But I wonder what happens with >> hdparm, since it seems to trigger one of these tests. Very puzzling. >> I'll dive in and take a look. > > The code (written 10 years ago) isn't the best in the world, > and will be redone entirely for hdparm-7.0 this year. > > But right now, it essentially does this: > > loop: > seek( to sector zero ); > read( 2MBytes ); > repeat loop for 3 seconds
Well for pure reading speed, I already use dd_rescue -d /dev/hda /dev/null Gives the same as hdparm -t when acting on uncached data.
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