On Mon, Feb 1, 2010 at 10:33 AM, Pasi Kärkkäinen <[email protected]> wrote: > > On Thu, Jan 28, 2010 at 01:44:00PM -0500, Joe Landman wrote: > > Pasi Kärkkäinen wrote: > > I suspect that they really aren't seeing ~1us latencies, but that with > > some neat tricks, it appears to be this. > > > > Physically, it isn't there. I'd classify this as a "marketing number" > > (e.g. unachievable in applications that matter). I'd be happy to be > > proven wrong, but there really isn't much to suggest that I am wrong. > > > > I hope I get to test some 10 Gbit Ethernet equipment soon.. let's see > what I can get myself.
If you want to repeat this test, please keep in mind that this test is CPU or memory-bound, not I/O-bound. Letting the block layer combine 512-byte blocks into larger blocks stresses the CPU and memory system. As an example, the command below reported between 200.000 and 400.000 IOPS, depending on the performance of the underlying hardware of the system the command was run on: fio --bs=512 --size=1G --buffered=1 --ioengine=sync --numjobs=1 --group_reporting --name=dev-null /dev/null Bart. -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/open-iscsi?hl=en.
