David> From: alan@lxorguk.ukuu.org.uk (Alan Cox) Date: Tue, 8 Sep
David> 1998 14:13:48 +0100 (BST)
> In 2.0.x I used 100% overcommit. With ethernet drivers doing
> rx_copybreak that comes out about right in the wash. It was
> originally a finger in air and gues exercise but it turned out
> near enough right
David> Ok, right.
David> The issue is to get the max benefit of SACK with even
David> moderately latent paths we need to up it a bit, this is the
David> crux of all the complaints we are getting.
David> So my question is, can we up the default safely and if so by
David> how much?
I would very much like to see an increased maximum value. I have been
running with significantly higher for a long time due to playing with
HIPPI and I have not experienced anything strange with my Ethernet
interfaces as a result of that.
Most commercial UNIXes seem to have a max limit of either 200000 or
262144, though I think many of them still have a default socket buffer
size of 8KB. Oh and SGI seems to go even higher.
Its not exactly scientific evidence, I admit ;-) Maybe setting the max
limit to 64KB for systems with less than 16MB and 256KB for systems
with more memory?
Jes
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