On Thursday 23 March 2006 12:50, Paolo Pisati wrote: > On Thu, Mar 23, 2006 at 11:12:24AM -0500, John Baldwin wrote: > > You probably want preemption on to minimize latency. > > i'm doing preemption now... > > > If this is a > > UP machine, you should turn SMP off. It might be interesting to > > compare using 7.x without APIC as well, since you are not using > > APIC on 4.x. > > ok, and what do we expect from it? > besides interrupt masking/eoi, what are the other areas influenced > by apic<->8259 switch? That's probably about it. > moreover, should i profile the asm part too? Well, it would be good if you could do that on both 4.x and 7.0 to get a better comparison. 4.x does most of the equivalent of intr_execute_handlers() in asm. > > APIC 8259 > | | > | | > ISR_VEC() INTR() > | | > | | we don't take any measure > ========================================== <= above this threshold... > lapic_handle_intr() atpic_handle_intr() > \ / > \ / > intr_execute_handlers() > | > | > . > . > . -- John Baldwin <jhb_at_FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.orgReceived on Thu Mar 23 2006 - 17:59:26 UTC
This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:38:54 UTC