Messages in this thread | | | Date | Tue, 02 Jan 2007 10:01:31 -0500 | From | Mark Lord <> | Subject | Re: 2.6.20-rc2+: CFQ halving disk throughput. |
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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
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