On Sun, Dec 14, 2014 at 08:06:20PM -0800, Jesse Barnes wrote:
> On 12/14/2014 4:59 AM, Chris Wilson wrote:
> >One of the things wbinvd is considered evil for is that it blocks the
> >CPU for an indeterminate amount of time - upsetting latency critcial
> >aspects of the OS. For example, the x86/mm h
On 12/14/2014 4:59 AM, Chris Wilson wrote:
> One of the things wbinvd is considered evil for is that it blocks the
> CPU for an indeterminate amount of time - upsetting latency critcial
> aspects of the OS. For example, the x86/mm has similar code to use
> wbinvd for large clflushes that caused a b
On Sat, Dec 13, 2014 at 07:08:22PM -0800, Ben Widawsky wrote:
> Any GEM driver which has very large objects and a slow CPU is subject to very
> long waits simply for clflushing incoherent objects. Generally, each
> individual
> object is not a problem, but if you have very large objects, or very m
