[Nottingham] Network TCP Tuning for Fast Links

Martin martin at ml1.co.uk
Mon May 28 00:56:53 BST 2007

Graeme Fowler wrote:
> For a true end-to-end set of settings, the most efficient MTU is the of
> the slowest (or lowest MTU) link.
> A colleague of mine was telling me at the end of last week that the
> redoubtable E1000 and TG3 cards used by many mainboard providers can in
> fact be a head of c**p. If anyone recalls how bad the RTL8139 chipset
> and driver was for 100BaseTX-FD in the early 2000's, you'll understand
> exactly how this can be the case for a supposedly "standard" chipset &
> driver.

Good notes, thanks.

Any Gbit NICs that are known to be "good" or work well or are simply
just Linux friendly?

> MTU=1500 is everyone's friend, more or less - unless you have a really
> bad broadband provider (or a cacky TG3, E1000 or RTL8139 card!), in
> which case throttle down to 400 or less!

Eeeeeek! And I thought an MTU <1000 was for back in the dark days of


Martin Lomas
martin at ml1.co.uk

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