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On Fri, 2002-12-06 at 23:55, Andrew Morton wrote: [...] > If the SMP machine is using scsi then that tends to make the elevator > changes less effective. Because the disk sort-of has its own internal > elevator which in my testing on a Fujitsu disk has the same ill-advised > design as the kernel's elevator: it treats reads and writes in a similar > manner. > > Setting the tag depth to zero helps heaps. Command tag queue? As in the compile time option? Or do you mean queue depth?(or are they the same) > But as you're interested in `desktop responsiveness' you should be > mostly testing against IDE disks. Their behavour tends to be quite > different. > > If you can turn on write caching on the SCSI disks that would change > the picture too. Just for clarity, What about for something like FC attached storage Where the controllers enforce cache policies on a "per volume" basis? Would that == the same thing? --The GrandMaster - 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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