[Nottingham] Network TCP Tuning for Fast Links
Duncan John Fyfe
djf at star.le.ac.uk
Tue May 29 10:45:34 BST 2007
On Sun, 2007-05-27 at 23:48 +0100, Martin wrote:
> >From a little reading around for why you can't get 1 Gbit/s down a Gbit
> network and...
> Using "fast" links, or even for internal networks, there
> can be some performance gains from tuning system TCP settings.
> A few links I've just scanned through are:
> And for bonding multiple links/interfaces:
> The short story is that you can greatly improve your data transfer rate
> over long internet links by increasing the system TCP tx and rx
> window/buffer values. Note also the comments in
> about software set buffer sizes.
> For internal networks fully under your control, you can greatly increase
> transfer rates and reduce CPU overheads by using "Jumbo packets" with an
> MTU of 9000. (Most new switches should support that. Check further
> before trying to go any larger.)
If you have not come across them before can I recommend articles linked
from this page:
In fact a trawl round http://www.clustermonkey.net/
provides a veritable treasure trove of well written documents on
everything to do with system performance.
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