Re: [Xen-devel] segfault in VM - FIXED!

[Chris Andrews <chris@xxxxxxxxxx>]

On 24 Jul 2004, at 13:47, I wrote:

> I'm just testing a patch which disables merging in the scsi layer when 
> it believes it has contiguous requests in different pages. I think 
> this is more pessimistic that it needs to be, as the pages may after 
> all be contiguous, but it does allow some merging  to happen and so 
> far seems to be stable.
I've given this a bit more testing, and it seems to be working fine - 
the machine is now running a dom0 kernel built while running the patch. 
As for performance, it's 'not bad' -- I've just done a bonnie++ run, 
and some compiles. Based on sticking printks in and watching the 
console, it's allowing merges much more often than not, but still I 
suspect not as much as it could. Probably it should use something with 
more arch-knowledge than page_to_phys().
patch for linux-2.4.26-xen0: 
http://munky.nodnol.org/~chris/xen_scsi_merge.diff
bonnie++ stats: http://munky.nodnol.org/~chris/munkyII_stats.txt

Chris.



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