From: Matthew Fredrickson <creslin@digium.com>
To: Tejun Heo <htejun@gmail.com>
Cc: linux-kernel@vger.kernel.org, ris <ris@elsat.net.pl>
Subject: Re: High CPU usage with sata_nv
Date: Mon, 12 Feb 2007 14:02:57 -0600 [thread overview]
Message-ID: <9d377bf8f83da4ca7935f5a69cde5bef@digium.com> (raw)
In-Reply-To: <45D00DF7.6090605@gmail.com>
On Feb 12, 2007, at 12:49 AM, Tejun Heo wrote:
> ris wrote:
>> procs -----------memory---------- ---swap-- -----io---- -system--
>> ----cpu----
>> r b swpd free buff cache si so bi bo in cs us
>> sy id wa
>> 0 0 0 303444 53224 360132 0 0 276 157 627 814 5
>> 2 89 4
>> 0 0 0 302956 53228 360332 0 0 196 0 1193 1686 2
>> 2 95 1
>> 0 0 0 303204 53228 360332 0 0 0 0 1175 1544 2
>> 1 97 0
>> 1 0 0 234656 53240 428880 0 0 34428 0 1498 2532 4
>> 11 69 16
>> 2 0 0 105776 53248 556372 0 0 63752 0 1729 2696 6
>> 18 47 29
>> 0 3 0 9464 53248 648708 0 0 43780 28008 1804 2262 6
>> 20 29 44
>> 0 3 2588 9548 51548 647488 0 0 19200 47616 1503 1903 4
>> 7 42 46
>> 0 3 2640 10152 50840 648480 0 0 24716 11876 1695 2251 5
>> 8 7 80
>> 1 2 2640 9788 46468 652052 0 0 54280 5620 1740 2687 6
>> 18 0 76
>> 0 3 2640 9788 46308 652500 0 0 43392 2212 1626 2038 5
>> 14 0 81
>> 1 2 2640 9636 46308 653000 0 0 38528 1164 1588 2181 4
>> 12 0 84
>> 0 3 2640 13872 46084 648264 0 0 30088 12972 1701 2223 4
>> 12 0 85
>> 0 4 2644 8460 37140 661572 0 2640 25648 26372 1615 1908 3
>> 10 0 88
>> 0 3 2644 9188 16760 683196 0 0 33840 48988 1639 2154 4
>> 12 0 84
>
> iowait != cpu busy. Your cpu idleness stays above 80%.
I have noticed something that might be related as well. I am working
on a device driver that would have periodic data errors due to
exceptionally long interrupt handling latency. I have come to the
point that I suspect that it's the sata_nv driver, and now that we
can't do the hdparm -u1 option for sata, it seems to be a bigger
problem.
Matthew Fredrickson
next prev parent reply other threads:[~2007-02-12 20:28 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20070115164541.M22367@elsat.net.pl>
2007-01-15 16:54 ` High CPU usage with sata_nv ris
2007-01-15 18:26 ` Frederik Deweerdt
2007-01-15 22:28 ` ris
2007-01-22 3:40 ` Tejun Heo
2007-02-11 22:31 ` ris
2007-02-12 6:49 ` Tejun Heo
2007-02-12 14:11 ` ris
2007-02-12 16:18 ` Tejun Heo
2007-02-12 20:02 ` Matthew Fredrickson [this message]
2007-02-12 20:09 ` Tejun Heo
[not found] <fa.1OWRIIUBXsZOXflsGLA+7d4YCc0@ifi.uio.no>
[not found] ` <fa.A0XBTh7eCfsh11d3AhMO71/4xQU@ifi.uio.no>
[not found] ` <fa.fCm35VohC2wt9vlkg94Ru7me4ic@ifi.uio.no>
[not found] ` <fa.qDqCne4pXntL0PolSS2j8t4py3g@ifi.uio.no>
[not found] ` <fa.8TboLRab6f7zzIWFr/JPM6q04Zo@ifi.uio.no>
[not found] ` <fa.PMqnzxUBiShkWV4h9SiztNIwYc0@ifi.uio.no>
2007-02-21 3:43 ` Robert Hancock
2007-02-21 15:28 ` Matthew Fredrickson
2007-02-21 18:04 ` Lee Revell
2007-02-22 2:34 ` Robert Hancock
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