On Mon, Sep 17, 2012 at 5:13 AM, Andres Freund <[email protected]> wrote: > On Monday, September 17, 2012 10:47:10 AM Jerome Glisse wrote: >> On Sun, Sep 16, 2012 at 7:18 PM, Andres Freund <[email protected]> wrote: >> > Hi everyone, >> > >> > In several gui programs, most notably and reproducably, I can trivially >> > make Xorg spend the whole cpu time in the kernel. It might be an Xorg >> > bug, but from my untrained gut feeling it doesn't look that way. >> > >> > Anything more you need than whats already in the email? >> >> > Here are some details: >> Is it an AGP card ? It looks like it's the PAT update that kills perf >> for you, not much we can do, the pool allocator is probably starve. > If you mean AGP as in the old strange graphics bus, no. Its a pcie card. > > If that helps you, more detailedly the card is a: SAPPHIRE Radeon HD6870 > > Unfortunately the manufacturers page is remarkably devoid of details...: > http://www.sapphiretech.com/presentation/product/?cid=1&gid=3&sgid=1037&lid=1&pid=1270&leg=0 > > Greetings, > > Andres
Well, then the issue is that it tries to allocate write combined pages on PCIE which should not happen. I don't see how in the code you endup in that path unless drm_pci_device_is_agp return true for some reasons. Cheers, Jerome -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
