Re: [Xen-users] 10gig in domU Simon Hobson Thu Apr 12 01:01:16 2012
Kristoffer Harthing Egefelt wrote:
Using 10G interfaces on kernel 3.2 + xen 4.1.2 we're seeing: dom0 ~9.2Gbps domU *~2.5Gbps* dmesg on domU: XENBUS: Device with no driver: device/vif/0 Is this normal?
I'm guessing so. I see those messages on every guest when I boot them, then a short time later there are messages relating to drivers/devices. Eg :
[ 0.500122] XENBUS: Device with no driver: device/vbd/51713 [ 0.500130] XENBUS: Device with no driver: device/vbd/51714 [ 0.500137] XENBUS: Device with no driver: device/vbd/51715 [ 0.500146] XENBUS: Device with no driver: device/vif/0 [ 0.500153] XENBUS: Device with no driver: device/vif/1 [ 0.500160] XENBUS: Device with no driver: device/console/0 ... [ 0.575270] Initialising Xen virtual ethernet driver. [ 0.669515] blkfront: xvda1: barrier: enabled [ 0.672064] Setting capacity to 4194304 [ 0.672089] xvda1: detected capacity change from 0 to 2147483648 [ 0.673131] blkfront: xvda2: barrier: enabled [ 0.676030] Setting capacity to 4194304 [ 0.676056] xvda2: detected capacity change from 0 to 2147483648 [ 0.678393] blkfront: xvda3: barrier: enabled [ 0.700179] Setting capacity to 1048576As to performance, that has always been a weakness with Xen. AIUI, all the virtual network traffic is handled by a single thread in Dom0 and this creates a bottleneck. There is certainly a huge performance difference between accessing an iSCSI volume natively on the client (poor) vs accessing it on Dom0 and passing it through as a virtual block device (good).
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- [Xen-users] 10gig in domU Kristoffer Harthing Egefelt 2012/04/12
- Re: [Xen-users] 10gig in domU Simon Hobson 2012/04/12 <=