On Sat, 06 Sep 2008 14:04:30 +0200 Fabian Deutsch <[EMAIL PROTECTED]> wrote:
> Am Samstag, den 06.09.2008, 09:40 +0200 schrieb Christian Borntraeger: > > Am Montag, 1. September 2008 schrieb Fabian Deutsch: > > > Hey. > > > > > > I'm observing some network problems when using virtio and a tap > > > if. The trouble is a drop of network troughput from abot 90Mbit/s > > > to > about > > 90kbit/s, > > > after about 1.7 TB of transferred data. > > > > > > Setup > > > Host: > > > - Fedora 8, nearly all updates > > > - Intel(R) Xeon(R) CPU X3210 @ 2.13GHz > > > - 8GB RAM > > > - 2 Guests > > > > > > Guest: > > > - Fedora 9 all updates > > > - virtio nic using tap > > > - samba sharing a mountpoint using an iscsi target > > > > Can you tell us what host kernel and what guest kernel you are > > using? > The were > > some changes to tun/tap for virtio lately which could make a > difference. > > Host: > Fedora 8 x86_64 > 2.6.25.14-69.fc8 SMP > kvm-72 > > Guest: > Fedora 9 i386 > 2.6.25.11-97.fc9.i686 I noticed the same behaviour using a rtl8139 and a tap device. After some MB's (!) I had to invoke a in the guest: ifdown eth0; ifup eth0 to get the network back again. I replaced the rtl-8139 by a virtio device and the problem seems to have gone, but I haven't tried yet with a large amount of data. kvm-73 (kvm74 gives compile errors) host: 64bit ubuntu-8.04-LTS with vanilla kernel 2.6.26.3 SMP guest: ubuntu-8.04-LTS with ubuntu kernel 32-bit On the same host runs a 32bit w2k3 (virtio NIC) and I haven't noticed such problems, even when this host ran with an rtl-8139 device. Sorry if I missed some postings concerning the issue, I just (re)subscribed to the list. R. -- ___________________________________________________________________ It is better to remain silent and be thought a fool, than to speak aloud and remove all doubt. +------------------------------------------------------------------+ | Richard Lucassen, Utrecht | | Public key and email address: | | http://www.lucassen.org/mail-pubkey.html | +------------------------------------------------------------------+ -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
