[DRBD-user] Two newbie questions

Bart Coninckx bart.coninckx at telenet.be
Wed Aug 4 21:28:24 CEST 2010


On Wednesday 04 August 2010 21:10:39 Ben Beuchler wrote:
> > system can block-write. I'm interested in why the active-backup
> > recommendation, and other folks' experiences with bonding.
> 
> My recollection from Florian Haas' presentation:
> 
> Bonding works well when you have UDP traffic or multiple TCP streams.
> However when you push a single TCP stream across a bonded ethernet
> link, the remote end gets bogged down handling the out-of-order
> packets and your overall throughput can actually *decrease*.  My notes
> indicate that their experimenting showed that adding a second bonded
> ethernet link resulted in about a 60% increase in throughput.  Adding
> a third link dropped throughput to the same as a single link.

Indeed, I had this problem and fixed it by changing tcp_reordening or 
something in /proc/something


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