Vu Pham wrote:
Vladislav Bolkhovitin wrote:
Cameron Harr wrote:
Vladislav Bolkhovitin wrote:
I guess, you use a regular caching IO? The lowest packet size
it can produce is a PAGE_SIZE (4K). Target can't change it. You
can have lower packets only with O_DIRECT or sg interface. But
I'm not sure it will be performance effective.
I do everything with Direct IO, which is automatic when using
the BLOCKIO method in SCST.
I meant on initiator(s), not on the target.
Sorry - but yes, I always run the benchmark apps with direct IO
Then, there's one more reason why we should find out the cause of
such a big variation between runs. Can you repeat all the tests
with the latest SCST SVN trunk/ including SRPT driver with each run
for at least few minutes?
From a little testing, the updated SCST tree doesn't work with the
OFED-1.3.1 SRP stack, though I have gotten it working with the
infiniband drivers in the normal distribution kernel. Shall I use
those modules?
I think, only Vu can answer it.
ofed-1.3.1 srpt only works with scst-1.0.0
You can run 2.6.26 + its IB stack + latest SVN scst and srpt
-vu
I think I'm stuck with the default CentOS kernel: 2.6.18-92.1.13.el5,
but I can use that.
Also, as I mentioned before, my time is going to be fairly limited
for a while, but I'll try to squeeze this in and will make sure I
run for longer periods of time. I'll also try to calculate an exact
end number based on iop/runtime.
Which backstorage do you use for BLOCKIO?
Fusion IO ioDrive. I generally use 1 or 2, but somtimes up to 4 at a
time.
It might be a reason of not stable results. Can you try with NULLIO
to narrow things down a bit?
I actually tested NULLIO a while back at Vu's suggestion, but I believe
I forgot to report on it. From my recollection, NULLIO gave me pretty
consistent block sizes of 512B, which is the BS I used in the benchmark.
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