linux-kernel - Re: slow UML on x86-64, soft lockups

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Date:	Thu, 9 Nov 2006 01:37:35 +0100 (CET)
From:	Paolo Giarrusso <blaisorblade@...oo.it>
To:	Jeff Garzik <jeff@...zik.org>, Jeff Dike <jdike@...toit.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: slow UML on x86-64, soft lockups

Jeff Garzik <jeff@...zik.org> ha scritto:

> Recent 2.6.18 / 2.6.19-rc kernels run at the expected speed, on
> 32-bit 
> x86, with a Fedora Core 5 or 6 UML userland.  However, on 64-bit
> x86-64 
> with a 64-bit UML userland, the kernel is achingly slow.  It works,
> 
> but...  Login takes several minutes (via ssh from host or xterm 
> console), and soft lockup traces continually print to the screen
> (see 
> output below).  Once logged into, programs work, but again, very
> slowly. 
>   Commands which complete in under a second normally often takes
> minutes.
> 

> Any ideas?  I guess there is a bug in the 64-bit UML timer code?
Yes, there is. Jeff, after our discussion, did I send you the patch
for this (not sure whether tested, I haven't reproduced this bug yet,
but fairly obvious)?

It is attached but I'm answering from a webmail (it happens since I'm
so busy), so I decline responsibility for any MIME content (I'm
sorry, yes).

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