Mailing List Archive: Gentoo: SPARC

[PATCH] 2.6.x SMP UltraSPARC instability

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davem at davemloft

May 3, 2005, 5:05 PM

Post #1 of 3 (660 views)
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[PATCH] 2.6.x SMP UltraSPARC instability

Can folks seeing problems on SMP sparc64 boxes with 2.6.x
give this patch a try?

--- 1/arch/sparc64/kernel/irq.c.~1~ 2005-04-29 05:51:44.000000000 -0700
+++ 2/arch/sparc64/kernel/irq.c 2005-04-29 05:52:10.000000000 -0700
@@ -756,7 +756,7 @@
clear_softint(clr_mask);
}
#else
- int should_forward = 1;
+ int should_forward = 0;

clear_softint(1 << irq);
#endif
@@ -1007,10 +1007,10 @@
}
upa_writel(tid | IMAP_VALID, imap);

- while (!cpu_online(goal_cpu)) {
+ do {
if (++goal_cpu >= NR_CPUS)
goal_cpu = 0;
- }
+ } while (!cpu_online(goal_cpu));

return goal_cpu;
}
--
gentoo-sparc [at] gentoo mailing list

eradicator at gentoo

May 3, 2005, 9:18 PM

Post #2 of 3 (609 views)
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Re: [PATCH] 2.6.x SMP UltraSPARC instability [In reply to]

On Tue, 2005-05-03 at 17:05 -0700, David S. Miller wrote:
> Can folks seeing problems on SMP sparc64 boxes with 2.6.x
> give this patch a try?

Both cases compiled with gcc-3_3-branch dated 20040623 (post 3.3.4)

2.6.11 without patch:
crashes after about 2 minutes of uptime

2.6.12-rc3 with patch:
so far it's been up for about 10 minutes with no problems so far... I'm
going to leave it doing some high load tasks while I head out to go see
a movie... hopefully it'll still be up when I get back.

--Jeremy

system is an ultra2, and the following info is as reported under
2.4.29smp

/proc/cpuinfo
cpu : TI UltraSparc II (BlackBird)
fpu : UltraSparc II integrated FPU
promlib : Version 3 Revision 25
prom : 3.25.0
type : sun4u
ncpus probed : 2
ncpus active : 2
Cpu0Bogo : 591.46
Cpu0ClkTck : 0000000011a4959b
Cpu1Bogo : 591.46
Cpu1ClkTck : 0000000011a4959b
MMU Type : Spitfire
State:
CPU0: online
CPU1: online

I've heard scsi is sometimes a factor with some of the 2.6 issues, so
including this for good measure:

/proc/scsi/esp/0
Sparc ESP Host Adapter:
PROM node f006635c
PROM name SUNW,fas
ESP Model Happy Meal FAS
DMA Revision Rev HME/FAS
Live Targets [ 0 1 6 ]

Target # config3 Sync Capabilities Disconnect
Wide
0 000000c3 [0f,04] yes
yes
1 000000c3 [0f,04] yes
yes
6 00000081 [0f,04] yes
no

/proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: FUJITSU Model: MAB3045S SUN4.2G Rev: 1705
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 01 Lun: 00
Vendor: FUJITSU Model: MAB3045S SUN4.2G Rev: 1705
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 06 Lun: 00
Vendor: TOSHIBA Model: XM5701TASUN12XCD Rev: 0997
Type: CD-ROM ANSI SCSI revision: 02

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eradicator at gentoo

May 4, 2005, 3:53 AM

Post #3 of 3 (614 views)
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Re: [PATCH] 2.6.x SMP UltraSPARC instability [In reply to]

On Tue, 2005-05-03 at 21:18 -0700, Jeremy Huddleston wrote:
> On Tue, 2005-05-03 at 17:05 -0700, David S. Miller wrote:
> > Can folks seeing problems on SMP sparc64 boxes with 2.6.x
> > give this patch a try?
>
> Both cases compiled with gcc-3_3-branch dated 20040623 (post 3.3.4)
>
> 2.6.11 without patch:
> crashes after about 2 minutes of uptime
>
> 2.6.12-rc3 with patch:
> so far it's been up for about 10 minutes with no problems so far... I'm
> going to leave it doing some high load tasks while I head out to go see
> a movie... hopefully it'll still be up when I get back.
>
> --Jeremy
>
> system is an ultra2

Looking good still after almost 7 hours... also looks like I'm not
affected by the SCSI bugs others have hit as I've been doing a ton of
disk i/o with no problems... =)

$ uname -a
Linux yuffie 2.6.12-rc3-gentoo #1 SMP Tue May 3 20:21:05 PDT 2005
sparc64 sun4u
TI UltraSparc II (BlackBird)
GNU/Linux

$ uptime
03:51:23 up 6:43, 2 users, load average: 3.00, 3.00,
2.75

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