Re: Sluggishness in 2.6.7 caused by IDE stack

From: Kenneth Johansson
Date: Sat Sep 25 2004 - 09:15:43 EST


On Sat, 2004-09-25 at 07:26 -0500, Scott A Crosby wrote:
> Much of the CPU time was spent in system mode. I setup a quick
> oprofile, which blamed the function task_no_data_intr, but an
> opannotate reports confusing results, possibly from interrupts? dmesg
> reported nothing interesting.
>
>
> Scott
>
>
> *** vmstat output ***
>
> procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
> 1 1 410496 8520 14224 1253716 0 0 2180 16 409 633 10 43 0 48
> 7 1 410496 6920 14236 1255380 0 0 1668 20 589 832 9 18 0 73
> 3 0 410496 8264 14232 1253988 0 0 2436 80 334 438 18 82 0 0
> 0 1 410496 8384 14244 1253860 0 0 1932 0 464 706 13 35 0 52
> 5 1 410496 8056 14264 1253872 328 0 2280 0 717 965 14 20 0 65
> 8 1 410496 7352 14268 1254640 0 0 2692 0 351 485 17 83 0 0
> 2 2 410496 6968 14264 1255036 32 0 2336 0 332 522 17 83 0 0
> 5 0 410496 8568 14276 1253384 0 0 2192 12 464 794 19 33 0 48

I think you have the same problem as me. The interrupt rate drops under
1000 during use of the DVD and that is strange as the HZ is 1000 and
that should be the lowest possible value unless I misunderstood
something.





-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/