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Re: [Xen-devel] Xen / Dell 2850 PERC 4e/Di lock up

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Subject: Re: [Xen-devel] Xen / Dell 2850 PERC 4e/Di lock up
From: Shane Chen <inconceivable@xxxxxxxxx>
Date: Tue, 19 Jul 2005 14:39:21 -0700
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Reply-to: Shane Chen <inconceivable@xxxxxxxxx>
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On 7/19/05, Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx> wrote:
> Have you tried 2.0-testing with 'noirqballance'?

I have to admit and say that I did post before I had turned up the
noirqbalance thread.  I've since then compiled a new testing kernel
(dea74c466948d94a181bf0009c44ea51  xen-2.0-testing-src.tgz) and tried
the noirqbalance (and did some more troubleshooting - more below).

First, the noirqbalance does help.  The box definitely does not
completely lock up.  But it would still sort of pause briefly.  I
guess you could say that it stutters.  However, I'm not completely
sure I managed to get it working because I never saw "XEN: Platform
quirk -- Disabling IRQ balancing/affinity" when I did `xm dmesg`.  So
then the curious question for me is then why it didn't completely hang
when I tried the same thing (multiple times).

Second, it turns out that I lied about the nousb thing.  The kernel I
had compiled used USB as modules.  So that even if you pass it nousb,
the coldplug script on gentoo manages to load all of the usb modules

If I manually unload the usb modules, the lock up completely goes away
(does not stutter).  Since I don't need USB for my Xen project, I've
gone ahead and disabled it the in the BIOS.

I'll be glad to provide addtional information or try additional things
and give feedback.


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