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xen-devel
RE: [Xen-devel] httpd persormance in Xen environment.
> etc.) To test the performance of httpd I am using httperf
> with either persistend and non-persistent connections. When
> persistent connections are enebled, I get very close
> performance on xenolinux to native Linux, but when they are
> disabled the server performance over xenolinux really
> suffers. To give you a rough estimates how bad it is here
> are some numbers.
Have you enabled connection tracking in the dom0 kernel as this can slow
things down? Does 'dmesg' show anything being logged?
[Just to be sure, are you getting the poor performance with non
persistent connections, right?]
Ian
> persistent enabled reply rate native xenolinux
> 4000 req/sec 3900 rep/sec 700 rep/sec
> persistent disabled
> 4000 req/sec 3950 rep/sec
> 3950 rep/sec
>
> I understand why the case of persistent connections performs
> better than the non-persistent, however in the former case
> httpd performance under xenolinux is buffeling to me.
>
> I suspect it is due to misconfiguration rather than xen issue
> and I will appreciate if some of you provide any advices on
> what needs to be checked.
>
> The modifications that I have made to the kernel
> configuration of linux, dom0 and dom0 are the following #
> enable tcp time-wait recycling echo 1 >
> /proc/sys/net/ipv4/tcp_tw_recycle
>
> #disable tcp timestamps
> echo 0 > /proc/sys/net/ipv4/tcp_timestamps
>
> # increase the number of local ports that are available for
> use echo 5000 65535 > /proc/sys/net/ipv4/ip_local_port_range
>
> max number of open file descriptors for each processor is
> increased to 32K.
>
> Native linux runs FC2 2.8.1 kernel that was compiled with
> different configuration than 2.6.8.1-xen0 and 2.6.8.1-xenU.
> (perhaps the first place to check?)
>
> nayden
>
>
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