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xen-devel
RE: [Xen-devel] Serious performance issues
> 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
>
>
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