lkml.org 
[lkml]   [2004]   [Dec]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: page fault scalability patch V12 [0/7]: Overview and performance tests
From
Date
On Thu, 2004-12-02 at 02:00 -0500, Jeff Garzik wrote:

>
> 2.6.9:
> bitbang ATA taskfile registers
> queue_work()
> workqueue thread bitbangs ATA data register (read id page)
>
> So I wonder if <something> doesn't like CPU 0 sending I/O traffic to the
> on-board SATA PCI device, then immediately after that, CPU 1 sending I/O
> traffic.
>
> Anyway, back to debugging... :)

They may not end up in order if they are stores (the stores to the
taskfile may be out of order vs; the loads/stores to/from the data
register) unless you have a spinlock protecting both or a full sync (on
ppc), but then, I don't know the ordering things on x86_64. This could
certainly be a problem on ppc & ppc64 too.

Ben.


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:08    [W:0.209 / U:28.808 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site