On Tue, Aug 20, 2013 at 08:32:22PM +0200, Heinz Diehl wrote:
> On 20.08.2013, Mihai T. Lazarescu wrote:
>
> > Here are the program numbers while running the script:
> >
> > CFQ:
> [....]
>
> Seems that cfq performs better on your machine, under this workload.
Apparently so. But I can't explain the really poor performance
of the other schedulers.
> I run an OCZ Vertex 4, filesystem is XFS mounted with
> "rw,noatime,attr2,discard,nobarrier,inode64,logbufs=8,logbsize=256k,noquota".
>
> These are my deadline parameters:
> echo "deadline" > /sys/block/sda/queue/scheduler
> echo "0" > /sys/block/sda/queue/iosched/front_merges
> echo "8" > /sys/block/sda/queue/iosched/fifo_batch
>
> These are the disk "tunings":
> /sbin/hdparm -W1 /dev/sda
> /sbin/blockdev --setra 8192 /dev/sda
Mine has mostly F19 defaults:
* ext4 with "rw,relatime,discard,data=ordered"
* cat /sys/block/sda/queue/scheduler: deadline
* cat /sys/block/sda/queue/iosched/front_merges: 1
* cat /sys/block/sda/queue/iosched/fifo_batch: 16
* hdparm /dev/sda:
multcount = 0 (off)
IO_support = 1 (32-bit)
readonly = 0 (off)
readahead = 256 (on)
geometry = 31130/255/63, sectors = 500118192, start = 0
* hdparm -W /dev/sda:
write-caching = 1 (on)
* blockdev --report /dev/sda:
RO RA SSZ BSZ StartSec Size Device
rw 256 512 4096 0 256060514304 /dev/sda
Mihai
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