Re: High CPU usage with sata_nv

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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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