Date: Thu, 10 Jul 2014 17:30:54 +0530 From: Kashyap Desai <kashyap.desai@avagotech.com> To: mav@freebsd.org Cc: FreeBSD-scsi <freebsd-scsi@freebsd.org> Subject: SSDs peformance on head/freebsd-10 stable using FIO Message-ID: <8fbe38cdad1e66717a9de7fdf63812c2@mail.gmail.com>
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Hi Motin, I am trying to collect IOPs and throughput using FIO on FreeBSD-10-stable as below post mentioned that CAM can reach upto 1,000,000 IOPS using Fine-Grained CAM locking. http://www.freebsd.org/news/status/report-2013-07-2013-09.html#GEOM-Direct-Dispatch-and-Fine-Grained-CAM-Locking I am using below FIO parameter. [global] ioengine=posixaio buffered=0 rw=randread bs=4K iodepth=32 numjobs=2 direct=1 runtime=60s thread group_reporting=1 [job1] filename=/dev/da0 [job2] filename=/dev/da1 [job3] filename=/dev/da2 [job4] filename=/dev/da3 [job4] filename=/dev/da4 .. I have 8 SSDs in my setup and all 8 SSDs are behind LSI’s 12Gp/s MegaRaid Controller as JBOD. I also found FIO can be used in Async mode after loading “aio” kernel module. Using single SSD, I am able to see 110K-130K IOPs. This IOPs counts are matching with what I see on Linux machine. Now, I am not able to scale IOPs on my machine after 200K. I see CPU is almost occupied and no idle time after IOPs reach to 200K. If you have any pointers to try with, I can do some experiment on my setup. Thanks, Kashyaphelp
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