Hi all, I'm trying to use disktest to measure the performance of an iSCSI device but get extremely low throughput...
For example, I did disktest -w -S0:1k -B 1024 /dev/sdb (/dev/sdb is the iSCSI device file, no partition or file system on it) And the result was: | 2010/01/05-02:58:26 | START | 27293 | v1.4.2 | /dev/sdb | Start args: -w -S0:1024k -B 1024 -PA (-I b) (-N 8385867) (-K 4) (-c) (-p R) (-L 1048577) (-D 0:100) (-t 0:2m) (-o 0) | 2010/01/05-02:58:26 | INFO | 27293 | v1.4.2 | /dev/sdb | Starting pass ^C| 2010/01/05-03:00:58 | STAT | 27293 | v1.4.2 | /dev/sdb | Total bytes written in 85578 transfers: 87631872 | 2010/01/05-03:00:58 | STAT | 27293 | v1.4.2 | /dev/sdb | Total write throughput: 701055.0B/s (0.67MB/s), IOPS 684.6/s. | 2010/01/05-03:00:58 | STAT | 27293 | v1.4.2 | /dev/sdb | Total Write Time: 125 seconds (0d0h2m5s) | 2010/01/05-03:00:58 | STAT | 27293 | v1.4.2 | /dev/sdb | Total overall runtime: 152 seconds (0d0h2m32s) | 2010/01/05-03:00:58 | END | 27293 | v1.4.2 | /dev/sdb | User Interrupt: Test Done (Passed) As you can see, the throughput was only 0.67MB/s and only 85578 written in 87631872 transfers... I also tweaked the options with "-p l" and/or "-I bd" (change seek pattern to linear and/or speficy IO type as block and direct IO) but no improvement happened... I thought this low throughput could be caused by the link rate or disk problem, but dd ruled it out.. $ dd if=/dev/zero of=/dev/sdb bs=1024 count=1048576 The throughput is 7.2 MB/s. There must be something I've done wrong with disktest... Could anyone maybe help me out here? Thanks a lot! jack ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ Ltp-list mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/ltp-list
