RE: [Xen-devel] httpd persormance in Xen environment.

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> 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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