Messages in this thread | | | From | Fernando Silveira <> | Date | Mon, 31 Aug 2009 11:33:43 -0300 | Subject | Re: I/O and pdflush |
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On Mon, Aug 31, 2009 at 11:07, Wu Fengguang<fengguang.wu@intel.com> wrote: > On Mon, Aug 31, 2009 at 10:01:13PM +0800, Wu Fengguang wrote: >> On Mon, Aug 31, 2009 at 10:00:06PM +0800, Wu Fengguang wrote: >> > Hi Fernando, >> > >> > What's your SSD's IO parameters? Ie. output of this command: >> > >> > grep -r . /sys/block/sda/queue/ >> > >> > Please replace 'sda' with your SSD device name. >> >> Oh I guess it's sdc: >> >> grep -r . /sys/block/sdc/queue/
Here is it:
# grep -r . /sys/block/sdc/queue/ /sys/block/sdc/queue/nr_requests:128 /sys/block/sdc/queue/read_ahead_kb:128 /sys/block/sdc/queue/max_hw_sectors_kb:128 /sys/block/sdc/queue/max_sectors_kb:128 /sys/block/sdc/queue/scheduler:noop anticipatory [deadline] cfq /sys/block/sdc/queue/hw_sector_size:512 /sys/block/sdc/queue/rotational:0 /sys/block/sdc/queue/nomerges:0 /sys/block/sdc/queue/rq_affinity:0 /sys/block/sdc/queue/iostats:1 /sys/block/sdc/queue/iosched/read_expire:500 /sys/block/sdc/queue/iosched/write_expire:5000 /sys/block/sdc/queue/iosched/writes_starved:2 /sys/block/sdc/queue/iosched/front_merges:1 /sys/block/sdc/queue/iosched/fifo_batch:16 #
These are probably default settings.
> BTW, would you run "iostat -x 1 5" (which will run 5 seconds) when > doing I/O in ideal throughput, and when in 25MB/s thoughput state?
Both files are attached (25mbps = 25MB/s, 80mbps = 80MB/s).
Thanks.
-- Fernando Silveira <fsilveira@gmail.com> [unhandled content-type:application/octet-stream][unhandled content-type:application/octet-stream] | |