On Tuesday 18 September 2007 20:41, Hisashi Hifumi wrote: > I modified my patch based on your comment. > > At 11:37 07/09/14, Andrew Morton wrote: > >So I do think that for safety and sanity's sake, we should be taking a > > ref on the pages when they are in a pagevec. That's going to hurt your > > nice performance numbers :( > > I did ping test again to observe performance deterioration caused by taking > a ref. > > -2.6.23-rc6-with-modifiedpatch > --- testmachine ping statistics --- > 3000 packets transmitted, 3000 received, 0% packet loss, time 53386ms > rtt min/avg/max/mdev = 0.074/0.110/4.716/0.147 ms, pipe 2, ipg/ewma > 17.801/0.129 ms > > The result for my original patch is as follows. > > -2.6.23-rc5-with-originalpatch > --- testmachine ping statistics --- > 3000 packets transmitted, 3000 received, 0% packet loss, time 51924ms > rtt min/avg/max/mdev = 0.072/0.108/3.884/0.114 ms, pipe 2, ipg/ewma > 17.314/0.091 ms > > > The influence to response was small.
It would be interesting to test -mm kernels. They have a patch which reduces zone lock contention quite a lot. I think your patch is a nice idea, and with less zone lock contention in other areas, it is possible that it might produce a relatively larger improvement. - 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/
