[lkml]   [2008]   [Jul]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Spinlocks: Factor our GENERIC_LOCKBREAK in order to avoid spin with irqs disable
Nick Piggin wrote:
> Although, you wouldn't need to oversubscribe physical CPUs to hit
> suboptimal behaviour.
> Basically, I just ask for performance improvement to be measured
> with some "realistic" configuration, then it should be easier to
> justify.

Overcommitting cpus system-wide is pretty common. A use-case is
consolidating a pile of underused non-performance-critical servers into
one physical machine with a lot of VMs. It doesn't take much load to
cause a dhcp request to the dhcp server to steal a cpu away from the
mysql server while it holds a lock...

I'll mail out my patches so we can have a more concrete discussion shortly.


 \ /
  Last update: 2008-07-07 17:59    [W:0.095 / U:1.608 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site