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xen-bugs
[Xen-bugs] [Bug 537] Xen0 bogomips has a lot of differences with Native
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=537
------- Additional Comments From yongkang.you@xxxxxxxxx 2006-02-17 01:33
-------
After I change the CONFIG_HZ from 250 to 100. The bogomips drops too. It is
more close to the Native Linux. Its now 6002.90 (Native is 5980.16). The
Native Linux kernel is 2.6.9.
The old 2.6 kernel default HZ should be set to 1000, am I right? So why should
latest Xen0 set 100, it will get more close bogomips with native Linux.
But I found if I set the CONFIG_HZ to 100. Xen0 Linux interrupts number will
lost many, I use `cat /proc/interrupts|grep timer; sleep 10;
cat /proc/interrupts|grep timer` to count interrupts number between 10
seconds. I only catch 300 times interrupt when I run above script. I think it
should be 1000 (100 interrupts/sec x 10 secs). BTW, my Xen0 is SMP enabled. I
count 2 CPUs interrupts together.
And I found the interrupts number of 10 seconds doesn't change, no matter
HZ=250 or 100. It is always 300 (I run a lot of time). E.g.
[root@vt-yyou ~]# cat /proc/interrupts |grep timer;sleep
10;cat /proc/interrupts |grep timer
256: 11200 0 Dynamic-irq timer0
261: 0 3618 Dynamic-irq timer1
256: 11472 0 Dynamic-irq timer0
261: 0 3637 Dynamic-irq timer1
---------------------------------------------------
CPU0 CPU1
I think they have a lot of differents with Xen 3.0.0. Any comments?
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