On Sunday 13 July 2008, Evgeniy Polyakov wrote: > On Sat, Jul 12, 2008 at 05:40:25PM +0300, Denys Fedoryshchenko (denys@xxxxxxxxxxx) wrote: > > Seems i found something. After issuing ethtool -K lo tso on i got significant performance improvement. > > Why it is not on by default? > > Without it performance is VERY poor. > > TSO over loopback turns to be GSO, which allows to aggregate multiple > packets into single frame. If system is not CPU bound, then it is likely > REDIRECT problem. If I understood you corerctly, loopback performance is > always good without REDIRECT, but fails to miserable level when > apprpriate rule is used? > No, seems it has performance issues without redirect(and conntrack unloaded too) even, iperf results on loopback is very unstable. Actually i dont understand, how on idle machine with Xeon processor iperf over loopback (tcp) can be ~100Mbps? I think it is a bug. -- ------ Technical Manager Virtual ISP S.A.L. Lebanon -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
