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Re: [Xen-devel] Xen cluster n/w performance (again!)


  • To: Keir Fraser <keir.fraser@xxxxxxxxxxxx>
  • From: Diwaker Gupta <diwakergupta@xxxxxxxxx>
  • Date: Tue, 23 Nov 2004 13:32:59 -0800
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxxxx
  • Delivery-date: Tue, 23 Nov 2004 21:37:45 +0000
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  • List-id: List for Xen developers <xen-devel.lists.sourceforge.net>

> One thing you might want to try is to change a line in the file
> linux-2.6.9-xenU/drivers/xen/netfront/netfront.c.
> From:
> #define RX_MIN_TARGET 8
> To:
> #define RX_MIN_TARGET NETIF_RX_RING_SIZE
> 
> One possibility is that dynamic buffer sizing is dropping some packets
> and causing TCP to crap itself.
> 
> If this improves things then I'll have to be much more careful about
> shrinking the buffers, and/or add a config option to disable the
> resizing completely.
> 
>  -- Keir
> 

My bad.

Sorry about the false alarm everyone, it was a routing issue. With the
correct routing setup, I can see upto 930 Mbps between VMs running on
2 distinct physical machines in the cluster.

Cheers!

-- 
Diwaker Gupta
http://resolute.ucsd.edu/diwaker


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