Re: 2.1.111 VM and low memory machines

Alan Cox (
Mon, 27 Jul 1998 11:26:06 +0100 (BST)

> Nah, I think it should default to 8k. For those with low memory (i.e. below
> 16MB) I think its reasonable that they have to change their mounts arguments
> to make things more sane.

Your reasoning is a bit flawed here. You almost always want the smallest
block size the server is happy with. Otherwise you overrun the buffers
on smaller ethernet cards and with IP fragmentation you get to play the
lost packet lottery on fairly unreasonable probability curves.

> No there isn't. If you mean CONFIG_SKB_LARGE (which, I think, used to allow
> large TCP windows), it not used anywhere in the kernel source and should be
> removed from the file(s). I've submitted patches in the past that
> included removing this.

Queued. I'll swat it

> If you want large windows in 2.1.x, then try to convince DaveM and whomever
> else has a say in this that it doesn't break stuff. I have sysctl patches
> that allow up to 64k windows (without scaling) which I find work great over
> satellite, but I'm told windows over 32k break buggy stacks.

Some people have sign extension problems. Right now those are getting
pretty rare (they were almost entirely DOS stacks). Dave's call but I dont
have a problem with taking that one out for 2.2


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