linux-kernel - Re: High CPU usage with sata

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Message-Id: <9d377bf8f83da4ca7935f5a69cde5bef@digium.com>
Date:	Mon, 12 Feb 2007 14:02:57 -0600
From:	Matthew Fredrickson <creslin@...ium.com>
To:	Tejun Heo <htejun@...il.com>
Cc:	linux-kernel@...r.kernel.org, ris <ris@...at.net.pl>
Subject: Re: High CPU usage with sata_nv


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

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