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xen-users
RE: [Xen-users] low network performance
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
> funk menera
> Sent: 01 June 2007 13:43
> To: Schmidt, Werner (Werner); xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-users] low network performance
>
>
>
> "Schmidt, Werner (Werner)" <wernerschmidt@xxxxxxxxx> schrieb:
>
> > -----Original Message-----
> > From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> > [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
> > funk menera
> > Sent: 31 May 2007 17:32
> > To: xen-users@xxxxxxxxxxxxxxxxxxx
> > Subject: [Xen-users] low network performance
> >
> > Hi @list !
> >
> > This is my first posting so please have patience with
> > me ;)
> >
> > As the titel says, i have some problems with the
> > network performance.
> > I'm using Xen3.0.3 with Debian on domO and all over
> > domUs
> > Maybe the Hardware is interesting too...
> > AthlonXP 1700+ on MSI.K7T266Pro2 with 1GB RAM, 3
> > IDE-HDs without RAID and two Networkdevices with
> > Realtek chipset:
> > NIC1: 1GBit r8169 -> for LAN
> > NIC2: 100MBit 8139 -> for DSL
> > on the LAN-device is a D-LINK GBit 8-Port Switch
> > connected.
> >
> > Well i experienced the problems while listening to a
> > mp3 file on a domU using Samba. Or when extracting
> > sth. from/to a domU form/to my Laptop. Same for a
> > transport from domU <-> domU
> > Basically it feels laggy or not as fast as i'm used to
> > (as comparison: the same hardware on a debian-srv
> > withou XEN) and there are hang-ups
> >
> >
> > So a short test with netio shows me sth. like this:
> > Laptop -> domO : 11000 KByte/s for Tx and Rx
> > domO -> domU-mainsrv :
> > TCP connection established.
> > Packet size 1k bytes: 1870 KByte/s Tx, 12293
> > KByte/s Rx.
> > Packet size 2k bytes: 1659 KByte/s Tx, 13503
> > KByte/s Rx.
> > Packet size 4k bytes: 1893 KByte/s Tx, 14072
> > KByte/s Rx.
> > Packet size 8k bytes: 1869 KByte/s Tx, 16355
> > KByte/s Rx.
> > Packet size 16k bytes: 1810 KByte/s Tx, 14836
> > KByte/s Rx.
> > Packet size 32k bytes: 1636 KByte/s Tx, 16829
> > KByte/s Rx.
> > Done.
> >
> > as i go on
> > domU -> domU-efw21(Endian Firewall 2.1):
> > TCP connection established.
> > Packet size 1k bytes: 6753 KByte/s Tx, 5481 KByte/s
> > Rx.
> > Packet size 2k bytes: 6005 KByte/s Tx, 5532 KByte/s
> > Rx.
> > Packet size 4k bytes: 6216 KByte/s Tx, 5271 KByte/s
> > Rx.
> > Packet size 8k bytes: 5811 KByte/s Tx, 5491 KByte/s
> > Rx.
> > Packet size 16k bytes: 6236 KByte/s Tx, 5603 KByte/s
> > Rx.
> > Packet size 32k bytes: 5846 KByte/s Tx, 5588 KByte/s
> > Rx.
> > Done.
> >
> > That's terrific if i compare it with the speed which i
> > had before ... 28MByte/s ~ 50MB/s
> >
> > So i read some pages in the mailing list archive and
> > found sth. about para-virtual drivers which looked
> > like it could give me more bandwidth.
> > Anyhow i just got confused ...
> > Is para-virtualsiation meanwhile standard for
> > Linux-domUs ?
> > If not where can i get these drivers ?
>
> >
> > Maybe the reason for the low network performance is
> > somewhere else ?
>
>
> Note that i had similar problems in my tests (I tested
> the domU and dom0 network performance of multiple machines
> connected via Gigabit lan with 'iperf ')
> ;
> If you use the standard bridge configuration (which I
> assume is true for your system), you might try to get a
> better performance by modifying the 'txqueuelen' parameter of
> the vif devices connecting the domUs to the dom0 bridge
> ('ifconfig vifx.y' will show the value of this parameter)
> You can see with 'brctl show' which vifs are involved.
>
> In my case, the value was set to '32'
> I got substantially better results of dom0->domU
> performance (and domU -> domU performance) by changing this
> value to 128 ..512:
> 'ip link set vifx.y txqueuelen <value>' will do this
> change for you
>
> Werner
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
>
>
>
> Thanks for the reply.
> But changing the txqueuelen on all doms to 512 dind't bring
> up some performance enhancements on my system.
> Well the value before was a 0 at domO and 1000 at
> domUs... what ever that
> means.
>
> And i'm using the standard bridge-mode to connect the
> doms. But to get sure u may have a look at:
> http://www.neobiker.de/wiki/index.php?title=XEN_Netzwerk_f%C3%
> BCr_Firewall
> because i'm using this script for configuring the
> network.
> But as i understand this script uses bridging ...
>
> Well, do u also have a one-core CPU, so the problem
> might be comparible to my or do u use a
> dualcore-/quadcore-cpu or dual/quad-system with single
> CPUs ?
> This point is interesting for me anyway, because in a
> previous mail a Xen-USer told me about that the
> performance would be much better on such a system.
>
> So therefore i want to ask all of U@list what kind of
> system are u using and how good the performance is?
> So do u use ...
> a) a antiquated ;) single-core single CPU system as i
> do ?
> b)
> 'normal' dual singlecore-cpu System ?
> c) 1 dualcore/quadcore cpu ?
> d) more then 1 dualcore/quadcore cpu ? ... maybe 4 of
> them :O ? ... don't wanna know how big the overhead
> might be in this case :X
>
> And basically which version would u suggest to run the
> best performance? furthermoire i'd like to know if there is a
> important performance difference between a AMD or Intel system ?
>
> Allthough i'm not in the situation (as a poor student)
> to spend some hundred bucks for a new system :( i'm
> interested in that point ... U'll never know where u
> find some money ;)
>
> So i just wanna know about the performance to solve my
> question if the system would run as i was used to or
> if there remains some bottlenecks ?
> Basically i don't need high cpu-power bout a good and
> reliable network and harddisk performance !
>
> Reagrds,
> fuki
>
> P.S. Any other hint/tips/link for giving my system
> better performance is highly desired !
>
>
>
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