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SubjectRe: repeatable SMP lockups - kernel 2.4.9
On Fri, 14 Sep 2001, Matthias Haase wrote:

> Our new SMP file- and printserver locks always hard up, if higher load
> come on the NIC. True stable without networking (X11, DRI

I have the similar problems with 4 routers here, they get quite high
network load sometimes... not really good.

> 1. First, I have changed the NIC from 3Com (vortex-driver) to noname,
> driven by Realtek
> RTL-8139 (rev 10) and the lockup occurs some later, but it occurs
> repeatable if I copy large file on LAN, or export an X11 environment to
> another box.

I used to be able to get the routers to hang in under 30minutes, but with
2.4.8-ac12 one of them survived my testing for over 36hours.

But when I put it into production thinking that it's more stable than the
other kernels it hung after 5-10minutes of operation.

> 2. Changing the kernel to 2.2.19 results the same thing.

Havn't tried any 2.2 kernels here because I want iptables.

> Donald Becker wrote, that he think, this apparently could be a bug with
> the interrupt handling in the 2.4.9 kernel, not inside
> the (his) driver itself.
>
> The boot on the mainboard (Asus CUV266-D, 2x PIII 1 GHz, 512 mb DDR-RAM)
> is always o.k. with APIC, excepting the 'unexpected IO-APIC, please mail'
> - warning.
> The lockup occurs too with 'noapic' on boot.

Our routers consists of Asus P3C-D (i820 chipset), 2xpIII 800MHz, 256MB
rimm. As a lot of people know, the i820 chipset is very unstable _if_ you
have SDRAM but not with rimm as it was built for.

Running with 'noapic' still freezes but I don't think it occurs as
frequently as when runnign with IOAPIC.

> At third stage I can try another and 'smp-cleaner' (I think) NIC, D-Link
> DFE-500 TX, based on DEC-Chip, using the tulip-driver.

I'm using D-Link DFE-570TX which is a quad tulip (DECchip 21143 rev 65).
I've been using both the stock driver in the kernels and an optimzed one,
I get a lockup with both.

> Nothing is wrote about this in /var/log messages. The box is SCSI only,

Just a hard lockup, it doesn't say anything at all, just a freeze,
keyboard doesn't work (not even numlock).

I also have a Adaptec 29160 card in our routers for logging to a
scsi-disk. Now that I think of it, the one I thought was stable didn't
have a SCSI-disk in it, and then I moved the flashdisk to the other router
that was in production and that died (but the logging isn't running).

> /proc/interrupts:
>
> CPU0 CPU1
> 0: 273705 282423 IO-APIC-edge timer
> 1: 4891 5117 IO-APIC-edge keyboard
> 2: 0 0 XT-PIC cascade
> 8: 0 1 IO-APIC-edge rtc
> 10: 8578 8328 IO-APIC-level aic7xxx
> 11: 962066 961390 IO-APIC-level mga@PCI:1:0:0, es1371
> 12: 109685 111089 IO-APIC-edge PS/2 Mouse
> 15: 2273 2295 IO-APIC-level eth0
> NMI: 0 0
> LOC: 556044 556060
> ERR: 0
> MIS: 0
>
>
> Looks clean :-(

Looks as clean as in my routers and then suddenly a freeze comes along and
ruins my day (I have watchdogcards but it still ruins my day knowing that
the router froze)

> Are there any patches, hints or recommendations known about this?

I havn't found anything about this at all :(

I have two of these routers right here next to my desk and I'm going to do
some heavy testing on them, one of them is the one I thought was stable
and the other one is virtually untested. I'm going to try with and without
scsi-cards and comparing BIOS-settings om them (But with my luck I'm
probably going to manage to make the "maybe stable" router freeze too.

/Martin

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