Messages in this thread | | | Date | Thu, 10 Nov 2016 18:39:39 +0200 | From | Mika Westerberg <> | Subject | Re: [PATCH v1 1/1] mfd: intel-lpss: Try to enable Memory-Write-Invalidate |
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On Thu, Nov 10, 2016 at 05:22:40PM +0200, Andy Shevchenko wrote: > On Thu, 2016-11-10 at 16:59 +0200, Mika Westerberg wrote: > > On Thu, Nov 10, 2016 at 04:51:42PM +0200, Andy Shevchenko wrote: > > > Enable MWI mechanism if PCI bus master supports it. > > > > Why? > > It might be potential benefit in some cases. Documentation says that > standard Memory Write might supply more current data than in the CPU > modified cache line and "trashing a line in the cache may trash some > data that is more current that in the memory line". This allows to avoid > potential retries and other performance degradation issues on the bus. > Though, I dunno how to measure it. > > Would be enough to extend commit message by this paragraph?
That's better, yes.
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