lkml.org 
[lkml]   [2010]   [Aug]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: Serious problem with ticket spinlocks on ia64
Date
On Friday 27 of August 2010 22:29:41 Luck, Tony wrote:
> > If this is a memory ordering problem (and that seems quite plausible)
> > then a liberal sprinkling of "ia64_mf()" calls throughout the spinlock
> > routines would probably make it go away.
>
> I think I take this back ... if it were a memory ordering problem, then
> it could show up any time - not just at wrap-around.

Well, I wasn't originally sure if it only happens at wrap-around. OTOH I've
now modified my tests, so that they would also catch any other badness, and I
still only got another two failures after wrap-around.

From looking at the traces, I'm afraid this smells like another Itanium
erratum. I'm now trying to write a minimal test case...

Petr Tesarik


\
 
 \ /
  Last update: 2010-08-27 22:43    [W:0.075 / U:0.288 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site