Comment 147 for bug 541511

> --- Comment #122 from Indan Zupancic <email address hidden> 2010-04-19 05:36:35 PDT ---
> Since the libdrm and intel driver updates my system seems to be rock solid.
> That said, I tried your patches to see if it made any change. v7 had horrible
> performance, as expected, but v8 is considerably slower than unpatched too.
> E.g.
> "time dmesg" in rxvt takes a lot longer (2x or more) and it all feels slightly
> sluggish, not snappy as it is when unpatched. On the upside, it seems the text
> corruption is fixed by v8, though I'm not totally sure.

This is just with the kernel changed, right? Because 2.11 has taken a
rather severe hit against 2.10 for i8xx chipsets on some workloads (I'm
working on fixing it).

> On the downside, just when I thought everything was fine, I got the following
> warning (for the first time):
>
> WARNING: at /home/indan/src/linux-2.6/drivers/char/agp/intel-gtt.
> c:1007 intel_i830_chipset_flush+0x2e3/0x32d()
> Hardware name: 2371GHG
> i8xx chipset flush failed, expected: 827, cpu_read: 315
>
> So it seems we're not there yet.

Depends. It's definitely just a failed chipset flush (I've checked the
offset). But given enough time and testers, this is somewhat expected
because this patch just implements a probabilistic chipset flush. Tallying
all the chipset flushes of all testers easily gives on the order of 100mm
successful ones. Now if yours is the only one that failed, that's not a
problem. Please keep an eye on this and report any reoccurences - some
more tuning might be called for (perhaps even a module parameter).

Also please report if the glyph corruptions show up again.