Matthew Dillon wrote:
:So, at the request of bmilekic, I ran netpipe on a hyperthreading box (nonAFAIK, full hyperthreading support, as it is, has been merged to -stable. It consists of a patch to recognize the virtual CPUs, so they will be dealt with like any SMP system, as long as HTT is enabled on the BIOS.
:hyperthreading, I'll do when I can turn it off in BIOS next time I'm down
:there)
:...
:
:The results are here:
:
:http://bsdunix.net/performance
:
:all information on what command line options I used is in there.
:
:the difference with it on is pretty substantial, might be worth noting in
:tuning(7)
:
:-Trish
:
:--
:Trish Lynch [EMAIL PROTECTED]
Those results are indeed quite substantial. Before you modify tuning(7), though, lets wait a bit to see if anyone comes up with a
fix to the performance issue when idle_hlt is turned off. In particular
I would like to try using a per-cpu global test in the idle loop that
avoids doing any locked bus cycles.
Unfortunately I am not sure if I have any hyperthreading capable boxes.
My primary machine is a pentium 4 but it is running -stable.
Timecounter "i8254" frequency 1193182 Hz
Timecounter "TSC" frequency 1296069572 Hz
CPU: Pentium 4 (1296.07-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0xf07 Stepping = 7
Features=0x3febf9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,P
AT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,<b28>,ACC>
It has HTT set but it's only a 1.2GHz box and I heard somewhere that only
2+ GHz P4's had hyperthreading. I noticed some MFCs to stable that suggested hyperthreading support but I do not know if full hyperthreading
support has been MFCd yet or is intended to be MFCd to -stable.
--
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