On 2006/10/24 00:45, Per-Olov Sjvholm wrote: > > pf is disabled, between em0 and em1 whole traffic goes through > > kernel routing process (Navtel port A and em0 in one /24 network, > > and em1 and Navtel port B are in different /24 network) > > > > sysctl tcp.send & receive space is turned to 65535
this affects tcp sessions to the box itself, not routed packets. > > I think that it's somehow > > connected to chipsets of that cards and mainboard bridges which are > > responsible for transferring packets through the mainboard. motherboard chips can make a _big_ difference. > > So, we've changed to MP kernel and... scenario 1) hasn't changed at all > > (freeze all the time), and scenario 2 got 100% idle and 0% > > interrupts on both CPUs (strange, I thought that it'll be 1/2 of > > previous 75% :P). ... > > And another thing... SMP kernel wont help if (but you don't) you run PF as it > can't make use of SMP. Maybe it could be worse... But I don't know for sure. GENERIC.MP can help on some boards (even single-cpu boards, due to ioapic).
