On Tue, Oct 16, 2018 at 10:44 AM Russell King - ARM Linux <li...@armlinux.org.uk> wrote: > On Tue, Oct 16, 2018 at 10:00:19AM +0200, Linus Walleij wrote:
> > I am on deep waters with ARM assembly, admittedly. So I wanted to > > ask: OpenWRT has this cache patch: > > https://github.com/openwrt/openwrt/blob/master/target/linux/gemini/patches-4.14/0001-cache-patch-from-OpenWRT.patch > > I do not know why (sorry). > > > > Do you think that patch is actually a hack to hide the problem > > fixed with this patch? (OK maybe stupid question but...) > > No, it looks to me like a hack to make DMA cache handling "more > efficient" by cleaning/invalidating the entire cache when dealing > with large streaming buffers. Aha that makes a lot of sense. I will attempt to drop it from OpenWRT in the next kernel upgrade unless benchmarks can show that it is worth it. Thanks Russell! Linus Walleij
