Messages in this thread | | | Date | Thu, 29 Aug 2002 12:02:41 -0700 | From | Dave Hansen <> | Subject | Re: 2.5.32 IO performance issues |
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Rik van Riel wrote: > On Thu, 29 Aug 2002, Badari Pulavarty wrote: >>I am having severe IO performance problems with 2.5.32 (2.5.31 works fine). >>I was wondering what caused this. >> >>As you can see, IO rate went from >> >> 384MB/sec with 6% CPU utilization on 2.5.31 >> to >> 120MB/sec with 19% CPU utilization on 2.5.32 >> >>Any idea ? > > 384 MB/s is suspiciously fast. What kind of disk subsystem > do you have to achieve that speed ?
Oh, that's nothing! :)
> Hardware: 8x 700MHz P-III, 4 Qlogic FC controllers, 40 disks > Test: 40 dds on 40 raw devices (40 disks).
One tray of 10 10k RPM disks, per controller. The controllers are also spread across 2 completely separate 64bit/66Mhz PCI busses (not bridged).
Bus 10, device 8, function 0: SCSI storage controller: QLogic Corp. QLA2200 (#2) (rev 5). IRQ 23. Master Capable. Latency=96. Min Gnt=64. I/O at 0xb000 [0xb0ff]. Non-prefetchable 32 bit memory at 0xfe1ff000 [0xfe1fffff]. Bus 10, device 9, function 0: SCSI storage controller: QLogic Corp. QLA2200 (#3) (rev 5). IRQ 24. Master Capable. Latency=96. Min Gnt=64. I/O at 0xb100 [0xb1ff]. Non-prefetchable 32 bit memory at 0xfe1fe000 [0xfe1fefff]. Bus 13, device 6, function 0: SCSI storage controller: QLogic Corp. QLA2200 (#4) (rev 5). IRQ 21. Master Capable. Latency=96. Min Gnt=64. I/O at 0xd000 [0xd0ff]. Non-prefetchable 32 bit memory at 0xfebff000 [0xfebfffff]. Bus 13, device 7, function 0: SCSI storage controller: QLogic Corp. QLA2200 (#5) (rev 5). IRQ 22. Master Capable. Latency=96. Min Gnt=64. I/O at 0xd100 [0xd1ff]. Non-prefetchable 32 bit memory at 0xfebfe000 [0xfebfefff].
-- Dave Hansen haveblue@us.ibm.com
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