Messages in this thread | | | Date | Fri, 18 Apr 2003 17:49:12 +0200 | From | Toon van der Pas <> | Subject | Re: 2.5.67-mm4 |
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On Fri, Apr 18, 2003 at 01:45:36AM -0700, Andrew Morton wrote: > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.5/2.5.67/2.5.67-mm4/ > > . A bunch of anticipatory scheduler patches. > > For the first time ever, AS is working well with both IDE and SCSI > under all the usual tests. > > It works just fine on SCSI with zero TCQ tags, and with four TCQ tags. > At eight tags, read-vs-write performace is starting to measurably drop off. > At 32 tags it is about 2000x slower than at zero or four tags. > > My recommendation, as always, is to disable SCSI TCQ completely. If you > really must, set it to four tags.
What about drivers that bypass de SCSI layer? I administer a server with a Mylex RAID controller (DAC960)...
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