[Stgt-devel] Re: [Iscsitarget-devel] stgt a new version of iscsi target?

Vladislav Bolkhovitin vst at vlnb.net
Thu Dec 22 11:38:46 CET 2005


It would be helpful if you also gather CPU utilization statistics during 
the tests (user/kernel/idle/iowait time + context switches/sec rate).


FUJITA Tomonori wrote:
> I did some initial performance tests with both tgt versions and IET
> (as you know, another iSCSI software implementation runs in kernel
> space). All implementations run with write back policy so probably,
> there should be little real disk I/O effect. I started disktest
> benchmark software with cold cache state. The machine has 4 GB memory,
> 1.5K SCSI disk, 4 CPUs (x86_64).
> (disktest -PT -T10 -h1 -K8 -B8192 -ID /dev/sdc -w)
> o IET
> | 2005/12/21-18:05:15 | STAT  | 7259 | v1.2.8 | /dev/sdc | Total write throughput: 48195993.6B/s (45.96MB/s), IOPS 5883.3/s.
> o tgt (I/O in kernel space)
> | 2005/12/21-18:03:23 | STAT  | 7013 | v1.2.8 | /dev/sdc | Total write throughput: 45829324.8B/s (43.71MB/s), IOPS 5594.4/s.
> o mmap tgt
> | 2005/12/21-18:22:28 | STAT  | 7990 | v1.2.8 | /dev/sdc | Total write throughput: 25373900.8B/s (24.20MB/s), IOPS 3097.4/s.

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