On Wed, Nov 20, 2002 at 10:54:40PM -0800, Andrew Morton wrote:
> > I think this merits some investigation. I, for one, am a big user of
> > SIGIO in userspace C programs...
> OK, got it back to 119000. Each signal was calling copy_*_user 24 times.
> This gets it down to six.
Good eyes. But.. this also applies to 2.4 (which should also then
get faster). So the gap between 2.4 & 2.5 must be somewhere else ?
Also maybe we can do something about that multiple memcpy in copy_fpu_fxsave()
In fact, that looks a bit fishy. We copy 10 bytes each memcpy, but
advance the to ptr 5 bytes each iteration. What gives here ?
Dave
-- | Dave Jones. http://www.codemonkey.org.uk | SuSE Labs - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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