[DRBD-user] bonding more than two network cards still a bad idea?

Bart Coninckx bart.coninckx at telenet.be
Mon Oct 4 18:15:52 CEST 2010


On Friday 01 October 2010 04:30:45 J. Ryan Earl wrote:
> On Thu, Sep 30, 2010 at 11:22 AM, Bart Coninckx 
<bart.coninckx at telenet.be>wrote:
> > I just saw bonnie++ hit more than 250 MB/sec while my bonded gigabit
> > gives me
> > about 160 MB/sec with 30% TCP header penalty, so looking into this is
> > useful.
> 
> Forgot to mention, that bonnie++ number is likely involving pagecache and
> not actual to-storage throughput.  Have you increased your TCP windows
> (buffers), etc?  You should literally be able to get double throughput from
> two NICs over one.
> 
> -JR

JR,

I use -s 8048 (twice the available RAM) as a parameter for bonnie++. This 
results into 1,9 Gbit/sec, so I think I'm good there.

B.


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