lkml.org 
[lkml]   [2002]   [May]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: Kernel deadlock using nbd over acenic driver
Date
"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.



Peter
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:26    [W:0.033 / U:2.416 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site