On Sun, 5 Nov 2006, Jens Axboe wrote:
On Fri, Nov 03 2006, Brent Baccala wrote:
Does 7 microseconds seem a bit excessive for an io_submit (and a
gettimeofday)?
I guess you mean miliseconds, not microseconds. 7 miliseconds seems way
too long. I repeated your test here, and the 100 submits take 97000
microseconds here - or 97 miliseconds. So that's a little less than 1
msec per io_submit. Still pretty big. You can experiment with oprofile
to profile where the kernel spends its time in that period.
--
Jens Axboe
Yes, of course, milliseconds. I have enough other problems with this
program (measured in minutes, and no mistake that) that I doubt I'll
be profiling the kernel any time soon, but thank you for your help.
More than anything else, you've made me understand that I can't just
fire off a bunch of async requests like I'm tossing peanuts across the
table. I've really got to pay attention to what's in that kernel
queue and how it gets managed.
-bwb
Brent Baccala
[email protected]
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