Messages in this thread | | | From | "Peter T. Breuer" <> | Subject | Re: Kernel deadlock using nbd over acenic driver | Date | Wed, 15 May 2002 19:43:02 +0200 (MET DST) |
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"A month of sundays ago ptb wrote:" > There are also several studies being made from collaborators in > Heidelberg which show qualitative differences between new VM and old VM > behaviour on the _server_ side. Basically, put an old VM on the server, > and push data to it with VM, and you get something like a steady > 16.5MB/s. Put a new VM in and you get pulsed behaviour. Maybe 18.5MB/s > tops, dropping to nothing, then picking up again, at maybe 7s intervals.
I'll just let you know (in secret) one of the graphs that Arne sent me today ...
http://web.kip.uni-heidelberg.de/~wiebalck/results/plots/disk_net_GbE.pdf
I don't know the details of this experiment, but it's a push of data over the Giga-net through ENBD to a server with a modern VM. I think the timing on the server graph is slightly shifted .. I believe it's been shown in other experiments that the server disk i/o blocks first, and then the network backs up afterwards.
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