* Jason Dixon <ja...@dixongroup.net> [2009-04-16 07:18]: > We had a spare set of servers available, so I went back to the lab and > reproduced the traffic profile. I then tested the same load with the MP > kernel. My tests revealed that even though the kernel is not threaded, > we benefit from equal distribution of interrupts across all cores. Our > interrupt load effectively decreased by a factor of 4; since we aren't > performing any userland activity, the other 3 cores are otherwise > unused.
was this 4.5 or earlier? If earlier what you saw could be pic vs apic. since 4.5 we have apic usually on UP too. if it isn't that, I am stunned. could speculate about better cache usage, but that would be about the only idea i'd have. -- Henning Brauer, h...@bsws.de, henn...@openbsd.org BS Web Services, http://bsws.de Full-Service ISP - Secure Hosting, Mail and DNS Services Dedicated Servers, Rootservers, Application Hosting - Hamburg & Amsterdam
