On Tue, Apr 08, 2008 at 09:45:06AM -0400, Konrad Rzeszutek wrote:
> 
> > > What is the MTU set on your NICs? If it is 1500 (the default) a 4KB 
> > > transfer
> > > will have to be divided in four TCP packets and re-assembled on the 
> > > target side.
> > > This increases the amount of work that the TCP stack has to perform.
> > > 
> > 
> > Hmm.. I'm using read-ahead values from 128 kB (256) to 2 MB (4096).. so all 
> > of the
> > read-ahead values will cause many TCP packets anyway.. ?
> 
> Duh! Thougt the packets were in bytes, not in MBs. 
> 

Actually read-ahead value is 512 byte sectors.. 
so read-ahead of 4096 means 512 bytes * 4096 == 2048 kB == 2 MB.

-- Pasi

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