From: Richard Miller <9fans@hamnavoe.com>
To: 9fans@9fans.net
Subject: Re: [9fans] usb slowness
Date: Mon, 5 Mar 2012 15:56:37 +0000 [thread overview]
Message-ID: <a8e253e864a522cd17f1389c0acb20c7@hamnavoe.com> (raw)
In-Reply-To: <2579b6.8126cb52.62GS.mx@tumtum.plumbweb.net>
> it turns out that _strayintr is taking up nearly all the time.
Or maybe it isn't. Taking up nearly all the cpu time isn't the
same as taking up nearly all the time. You can use time(1) while
reading usb disk to see if cpu is really the bottleneck, or if
in fact your machine is spending most of its time waiting for
a usb interrupt. If the machine is mostly idle, profiling clock
ticks should usually find it sitting at the HLT instruction which
happens to be couple of bytes before _strayintr.
next prev parent reply other threads:[~2012-03-05 15:56 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 [this message]
2012-03-06 0:01 ` Tristan
2012-03-06 10:39 ` Richard Miller
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