* Sluggishness in 2.6.7 caused by IDE stack
@ 2004-09-25 12:26 Scott A Crosby
2004-09-25 14:11 ` Kenneth Johansson
0 siblings, 1 reply; 3+ messages in thread
From: Scott A Crosby @ 2004-09-25 12:26 UTC (permalink / raw)
To: linux-kernel
I was burning a DVD-R on a new brand of media and I was experience
fairly high system sluggishness. I've burned other DVD's on a
different brand of media on this drive at a slower speed without this
effect.
The system is an Athlon XP 2500+ running 2.6.7 with a Liteon 832s dvd
burner.
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
*** oprofile output ***
samples % app name symbol name
1217485 94.2994 vmlinux task_no_data_intr
7714 0.5975 firefox-bin (no symbols)
5975 0.4628 libc-2.3.2.so (no symbols)
5199 0.4027 vmlinux pci_bus_match_dynids
3798 0.2942 XFree86 (no symbols)
*** opreport -d output ***
c022f520 1218267 89.3898 task_no_data_intr
c022f530 2 1.6e-04
c022f535 30 0.0025
c022f53a 2186 0.1794
c022f54a 90 0.0074
c022f561 2 1.6e-04
c022f56d 1196860 98.2428
c022f570 19037 1.5626
c022f571 1 8.2e-05
c022f584 2 1.6e-04
c022f589 57 0.0047
*** Relevant assembly code in task_no_data_intr ***
c022f520 <task_no_data_intr>: /* task_no_data_intr total: 1218267 89.3898 */
:c022f520: sub $0x1c,%esp
:c022f523: mov %edi,0x14(%esp,1)
:c022f527: mov %ebx,0xc(%esp,1)
:c022f52b: mov %esi,0x10(%esp,1)
:c022f52f: mov 0x20(%esp,1),%edi
:c022f533: mov %ebp,0x18(%esp,1)
:c022f537: mov 0x70(%edi),%esi
2186 0.1604 :c022f53a: mov 0x8(%esi),%eax
:c022f53d: mov 0x20(%eax),%eax
:c022f540: mov 0x68(%eax),%ebp
:c022f543: sti
:c022f544: mov 0x70(%edi),%eax
:c022f547: mov 0x34(%eax),%eax
90 0.0066 :c022f54a: mov %eax,(%esp,1)
:c022f54d: call *0x4b8(%esi)
:c022f553: movzbl %al,%ebx
:c022f556: mov %ebx,%eax
:c022f558: and $0xc9,%eax
:c022f55d: cmp $0x40,%eax
:c022f560: je c022f58b <task_no_data_intr+0x6b>
:c022f562: mov 0x1c(%edi),%eax
:c022f565: mov %edi,(%esp,1)
:c022f568: movl $0xc02dfecf,0x4(%esp,1)
19037 1.3968 :c022f570: mov %ebx,0x8(%esp,1)
:c022f574: call *0x20(%eax)
:c022f577: mov 0xc(%esp,1),%ebx
:c022f57b: mov 0x10(%esp,1),%esi
:c022f57f: mov 0x14(%esp,1),%edi
:c022f583: mov 0x18(%esp,1),%ebp
:c022f587: add $0x1c,%esp
:c022f58a: ret
:c022f58b: test %ebp,%ebp
:c022f58d: je c022f5b1 <task_no_data_intr+0x91>
:c022f58f: mov 0x70(%edi),%eax
:c022f592: mov 0x1c(%eax),%eax
:c022f595: mov %eax,(%esp,1)
:c022f598: call *0x4b8(%esi)
:c022f59e: mov %edi,(%esp,1)
:c022f5a1: mov %ebx,0x4(%esp,1)
:c022f5a5: movzbl %al,%eax
:c022f5a8: mov %eax,0x8(%esp,1)
:c022f5ac: call c0229b90 <ide_end_drive_cmd>
:c022f5b1: xor %eax,%eax
:c022f5b3: jmp c022f577 <task_no_data_intr+0x57>
:c022f5b5: lea 0x0(%esi,1),%esi
:c022f5b9: lea 0x0(%edi,1),%edi
:
** Source code for function ***
** drivers/ide/ide-taskfile.c:278
ide_startstop_t task_no_data_intr (ide_drive_t *drive)
{
ide_task_t *args = HWGROUP(drive)->rq->special;
ide_hwif_t *hwif = HWIF(drive);
u8 stat;
local_irq_enable();
if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG),READY_STAT,BAD_STAT)) {
DTF("%s: command opcode 0x%02x\n", drive->name,
args->tfRegister[IDE_COMMAND_OFFSET]);
return DRIVER(drive)->error(drive, "task_no_data_intr", stat);
/* calls ide_end_drive_cmd */
}
if (args)
ide_end_drive_cmd(drive, stat, hwif->INB(IDE_ERROR_REG));
return ide_stopped;
}
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Sluggishness in 2.6.7 caused by IDE stack
2004-09-25 12:26 Sluggishness in 2.6.7 caused by IDE stack Scott A Crosby
@ 2004-09-25 14:11 ` Kenneth Johansson
2004-10-02 23:00 ` Kenneth Johansson
0 siblings, 1 reply; 3+ messages in thread
From: Kenneth Johansson @ 2004-09-25 14:11 UTC (permalink / raw)
To: Scott A Crosby; +Cc: linux-kernel
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.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Sluggishness in 2.6.7 caused by IDE stack
2004-09-25 14:11 ` Kenneth Johansson
@ 2004-10-02 23:00 ` Kenneth Johansson
0 siblings, 0 replies; 3+ messages in thread
From: Kenneth Johansson @ 2004-10-02 23:00 UTC (permalink / raw)
To: Scott A Crosby; +Cc: linux-kernel
[-- Attachment #1: Type: text/plain, Size: 1906 bytes --]
On Sat, 2004-09-25 at 16:11 +0200, Kenneth Johansson wrote:
> 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.
I did some more testing and it turns out that I was not using the via
IDE driver but some generic code. I had the IDE driver as a module and
it was loaded but it did only drive the two unused ports the generic
driver had control over the DVD drive. I removed CONFIG_IDE_GENERIC and
compiled the via driver into the kernel and everything work OK now.
I wonder why the generic code blocks interrupts but now I'm not that
interested in this problem anymore :)
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^ permalink raw reply [flat|nested] 3+ messages in thread
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