bert hubert <[EMAIL PROTECTED]> writes: > Hi people, > > I'm trying to save people the cost of buying extra servers by making > PowerDNS (GPL) ever faster, but I've hit a rather fundamental problem. > > Linux 2.6.20-rc4 appears to take 4 microseconds on my P4 3GHz for a > non-blocking UDPv4 recvfrom() call, both on loopback and ethernet.
P4s are pretty slow at taking locks (or rather doing atomical operations) and there are several of them in this path. You could try it with a UP kernel. Actually hotunplugging the other virtual CPU should be sufficient with recent kernels. Also BTW RDTSC on P4 is not very accurate for small measurements because it has a quite high overhead by itself, i would suggest running it in a loop. -Andi - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
