Messages in this thread | | | Date | Thu, 18 Sep 2003 08:57:22 +1000 | From | Nick Piggin <> | Subject | Re: I/O degredation with AS on 2.6.0-test3 |
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Mike Sullivan wrote:
> >>>Dave Hansen wrote: >>> >>>You might want to try Martin Bligh's diffprofile utility. It's a bit >>>hard to compare 2 500-line profiles without it. >>> >>>ftp://ftp.kernel.org/pub/linux/kernel/people/mbligh/tools/ >>> >>>Also, there have evidently been a few I/O scheduler fixes since -test3. >>>Please retry with -test5. >>> >>> > >>Nick Piggen wrote: >>More important, are they regressions vs. previous kernels with AS? >> > >I've checked 2.5.69mm9, 2.5.75, 2.6.0test3, and 2.6.0test5 and they all >show a >significant degradation in IO performance (>40%) when using the as >scheduler >compared to the deadline scheduler. > >Configuration: IBM x440 8way with hypertheading enabled, 16GB RAM, >4 QLA2310 FC adapters attached to 2 FastT900 controllers >(112 disks total). The 112 physical disks are striped as 8 raid 0 >logical disks. There are a total of 40 raw devices setup (5 per raid0 >disk). > >I've reattached excerpts from the database test for vmstat and >the readprofile diffs created from Martin's diffprofile utility >(diffprofile readp.as readp.dl). >
Thanks Mike, I'll get a patch for you to try soon. I'm a bit busy ATM.
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