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SubjectRe: [patch] voluntary-preempt-2.6.9-rc3-mm1-S9
On Mon, 4 Oct 2004 23:53:15 +0200
Ingo Molnar <mingo@elte.hu> wrote:

>
> i've released the -S9 VP patch:
>
> http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.9-rc3-mm2-S9
>

Something is fishy for me from S8 on. I justbooted into S9 and i see
many many xruns under load in jackd [as i saw in S8]. Since all my ll
settings are enabled as usual, something else must be wrong.

I find the following very interesting:

mango:~# ps aux|grep IRQ
root 12 0.0 0.0 0 0 ? S< 04:28 0:00 [IRQ 8]
root 14 0.0 0.0 0 0 ? S< 04:28 0:00 [IRQ 12]
root 15 0.0 0.0 0 0 ? S< 04:28 0:00 [IRQ 14]
root 16 0.0 0.0 0 0 ? S< 03:17 0:00 [IRQ 15]
root 17 0.0 0.0 0 0 ? S< 03:17 0:00 [IRQ 1]
root 314 0.0 0.0 0 0 ? S< 03:17 0:00 [IRQ 10]
root 7983 0.6 0.0 0 0 ? S< 03:26 0:03 [IRQ 5]
root 14617 0.0 0.0 1576 464 pts/2 R+ 03:35 0:00 grep IRQ
mango:~# chrt -p 7938
sched_getscheduler: No such process
failed to get pid 7938's policy
For other irq threads i get normal values [SCHED_OTHER].

Here's the usual tweakables. I find it interesting that the preempt
timing stuff is seemingly non working, either [see bottom]. Will boot
into S8 to see if i see similar things:

-----------
-----------
Linux mango.fruits.de 2.6.9-rc3-mm2-VP-S9LT #1 Tue Oct 5 03:07:49 CEST
2004 i686 GNU/Linux-----------
/proc/interrupts:
CPU0
0: 1233290 XT-PIC timer 0/33290
1: 4810 XT-PIC i8042 0/4810
2: 0 XT-PIC cascade 0/0
5: 863776 XT-PIC CS46XX 0/63776
8: 4 XT-PIC rtc 0/4
10: 1008 XT-PIC eth0 0/1008
12: 34888 XT-PIC i8042 0/34888
14: 927 XT-PIC ide0 0/927
15: 33585 XT-PIC ide1 0/33585
NMI: 0
ERR: 0
-----------
/proc/irq/1/i8042/threaded:1
/proc/irq/10/eth0/threaded:1
/proc/irq/12/i8042/threaded:1
/proc/irq/14/ide0/threaded:1
/proc/irq/15/ide1/threaded:1
/proc/irq/5/CS46XX/threaded:0
/proc/irq/8/rtc/threaded:0
-----------
/sys/block/hda/queue/max_sectors_kb:16
/sys/block/hdc/queue/max_sectors_kb:16
/sys/block/hdd/queue/max_sectors_kb:16
-----------
voluntary_preemption
1
kernel_preemption
1
softirq redirect
1
hardirq redirect
1
-----------
preempt_thresh
0
-----------
preempt_max_thresh
0
-----------
trace enabled
0
-----------

I also see some of these "Wait for ready failed before probe !" [in
dmesg] which have popped up somewhere along the line when VP was based
on mm [definetly in S8 and S9, dunno about earlier for sure]:

[snip]
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with
idebus=xx SIS5513: IDE controller at PCI slot 0000:00:02.5
SIS5513: chipset revision 208
SIS5513: not 100% native mode: will probe irqs later
SIS5513: SiS735 ATA 100 (2nd gen) controller
ide0: BM-DMA at 0xff00-0xff07, BIOS settings: hda:DMA, hdb:DMA
ide1: BM-DMA at 0xff08-0xff0f, BIOS settings: hdc:DMA, hdd:DMA
Probing IDE interface ide0...
hda: IC35L060AVER07-0, ATA DISK drive
requesting new irq thread for IRQ14...
elevator: using anticipatory as default io scheduler
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
Probing IDE interface ide1...
hdc: ST340823A, ATA DISK drive
hdd: TDK CDRW121032, ATAPI CD/DVD-ROM drive
requesting new irq thread for IRQ15...
ide1 at 0x170-0x177,0x376 on irq 15
Probing IDE interface ide2...
ide2: Wait for ready failed before probe !
Probing IDE interface ide3...
ide3: Wait for ready failed before probe !
Probing IDE interface ide4...
ide4: Wait for ready failed before probe !
Probing IDE interface ide5...
ide5: Wait for ready failed before probe !
hda: max request size: 128KiB
IRQ#14 thread started up.
hda: 120103200 sectors (61492 MB) w/1916KiB Cache, CHS=65535/16/63,
UDMA(100) hda: cache flushes not supported
hda: hda1 hda2 hda3
hdc: max request size: 128KiB
IRQ#15 thread started up.
hdc: Host Protected Area detected.
current capacity is 78165360 sectors (40020 MB)
native capacity is 78165361 sectors (40020 MB)
hdc: Host Protected Area disabled.
hdc: 78165361 sectors (40020 MB) w/1024KiB Cache, CHS=65535/16/63,
UDMA(33) hdc: cache flushes not supported
hdc: hdc1 hdc2
hdd: ATAPI 32X CD-ROM CD-R/RW drive, 2048kB Cache, DMA
Uniform CD-ROM driver Revision: 3.20
[snip]
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