RE: [Xen-devel] Serious performance issues

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

> Hi. I have a Shuttle box with an AMD Athlon XP 2200+ and 1GB of RAM.
> I'm normally running it with Debian sarge/sid and kernel 2.6.10-1-k7,
> as built by Debian. I want to use Xen on it. I built a xen0 kernel
> which is as close to the Debian kernel as I can (no power management,
> no HPET timers, broken ISA drivers disabled), disabled /lib/tls, and
> booted with the new kernel.

Please try using our kernel config.

BTW: you're not doing anything rash like using an SMP enabled kernel are
you? There's still loads of debugging turned on at the moment.

Ian
 
> Everything works. I can run domUs as I want. But, the performance is
> horrible, even with just dom0 running.
> 
> I tested the disk, it still transfers ~50MB/s. I don't seem to be
> suffering from PIO mode. Also, things running from RAM cache are as
> slow as from disk.
> 
> I ran some of the lmbench tests both under xen and with native linux.
> Here are the results, with the "-" lines from xen and "+" lines from
> native linux. The results are pretty poor, and so is the feel of the
> machine under xen.
> 
> Any hints on what to try next?
> 
> 
> bw_mem
> -0.131072 1068.95
> +0.131072 4409.00
> 
> bw_pipe
> -Pipe bandwidth: 85.42 MB/sec
> +Pipe bandwidth: 989.19 MB/sec
> 
> bw_unix
> -AF_UNIX sock stream bandwidth: 104.75 MB/sec
> +AF_UNIX sock stream bandwidth: 968.87 MB/sec
> 
> lat_ctx
> -"size=0k ovr=3.15
> -10 13.95
> +"size=0k ovr=1.09
> +10 0.94
> 
> lat_fcntl
> -Fcntl lock latency: 43.2246 microseconds
> +Fcntl lock latency: 5.4676 microseconds
> 
> lat_fifo
> -FIFO latency: 32.4076 microseconds
> +FIFO latency: 3.3622 microseconds
> 
> lat_fs
> -0k     1000    18563   31549
> -1k     1000    6426    17887
> -4k     1000    6583    17826
> -10k    1000    3084    14989
> +0k     1000    63666   92541
> +1k     1000    24125   51193
> +4k     1000    25863   52089
> +10k    1000    12533   41564
> 
> lat_pipe
> -Pipe latency: 31.0475 microseconds
> +Pipe latency: 5.4833 microseconds
> 
> lat_proc
> -Process fork+exit: 789.2857 microseconds
> +Process fork+exit: 113.7347 microseconds
> 
> lat_select
> -Select on 200 tcp fd's: 46.8159 microseconds
> +Select on 200 tcp fd's: 12.9369 microseconds
> 
> lat_syscall
> -Simple syscall: 0.6188 microseconds
> +Simple syscall: 0.1547 microseconds
> 
> lat_unix
> -AF_UNIX sock stream latency: 61.1547 microseconds
> +AF_UNIX sock stream latency: 21.7704 microseconds
> 
> 
> -------------------------------------------------------
> SF email is sponsored by - The IT Product Guide
> Read honest & candid reviews on hundreds of IT Products from 
> real users.
> Discover which products truly live up to the hype. Start reading now.
> http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxxxx
> https://lists.sourceforge.net/lists/listinfo/xen-devel
> 


-------------------------------------------------------
SF email is sponsored by - The IT Product Guide
Read honest & candid reviews on hundreds of IT Products from real users.
Discover which products truly live up to the hype. Start reading now.
http://ads.osdn.com/?ad_ide95&alloc_id396&op=click
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/xen-devel