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