From: Richard Miller <9fans@hamnavoe.com>
To: 9fans@9fans.net
Subject: Re: [9fans] usb slowness
Date: Tue, 6 Mar 2012 10:39:51 +0000 [thread overview]
Message-ID: <a8a4d75adaf927ca6d650b46859510c5@hamnavoe.com> (raw)
In-Reply-To: <2579b8.491be6b4.43V1.mx@tumtum.plumbweb.net>
> if i force polling, it's a little faster: 0.01u 0.45s 17.70r
That's interesting - it shouldn't make a difference unless there's something
wrong with the controller or the driver. What did you do to force polling?
> holding a second, time wouldn't show interrupt-handling time, correct?
Yes, I think you're right - system cputime will only be incremented for
a running process. But you can watch the last column of /dev/sysstat
(or use 'stats -I') to see the percentage of time spent in interrupt handlers.
> load remains fairly low during both, but system calls and context
> switches are high.
How about number of interrupts? Erik's theory was that you were getting
too many of these.
prev parent reply other threads:[~2012-03-06 10:39 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-04 1:56 Tristan
2012-03-05 15:46 ` erik quanstrom
2012-03-05 16:05 ` Richard Miller
2012-03-05 16:14 ` erik quanstrom
2012-03-05 16:20 ` Richard Miller
2012-03-06 13:19 ` Tristan
2012-03-06 15:36 ` Tristan
2012-03-06 16:10 ` Richard Miller
2012-03-06 18:55 ` erik quanstrom
2012-03-06 22:22 ` Tristan
2012-03-07 5:50 ` Tristan
2012-03-07 5:53 ` Tristan
2012-03-07 9:31 ` Charles Forsyth
2012-03-10 3:13 ` [9fans] donehead changed before ack Tristan
2012-03-10 12:33 ` erik quanstrom
2012-03-10 15:14 ` Tristan
2012-03-07 15:27 ` [9fans] usb slowness Richard Miller
2012-03-05 15:56 ` Richard Miller
2012-03-06 0:01 ` Tristan
2012-03-06 10:39 ` Richard Miller [this message]
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