From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anthony Liguori Subject: Re: Serious performance issues Date: Fri, 04 Mar 2005 09:52:13 -0600 Message-ID: <4228842D.30505@us.ibm.com> References: <42278833.6050500@tv.debian.net> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit In-Reply-To: <42278833.6050500@tv.debian.net> Sender: xen-devel-admin@lists.sourceforge.net Errors-To: xen-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Tommi Virtanen Cc: xen-devel@lists.sourceforge.net List-Id: xen-devel@lists.xenproject.org Tommi Virtanen wrote: > 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. What version of Xen is this? > Any hints on what to try next? If you're running xen-unstable, try xen-2.0.x or vice versa. Are you absolutely positive that you've got enough memory allocated to dom0? That you've got the proper IO chipset support built into the kernel? That you've really got tls disabled (if you just move tls after an app has already launched using it it will still be using it until you restart the app)? These numbers seem too bad to be Xen's fault alone. Do you have swap enabled? Is there a great deal of swap activity? Regards, Anthony Liguori > 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@lists.sourceforge.net > 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_id=6595&alloc_id=14396&op=click