Re: [RFC][PATCH 2/9] deadlock prevention core

From: Evgeniy Polyakov
Date: Mon Aug 14 2006 - 04:30:43 EST

On Mon, Aug 14, 2006 at 10:15:52AM +0200, Peter Zijlstra (a.p.zijlstra@xxxxxxxxx) wrote:
> > If this refers to the socket buffers, they're mostly allocated with
> > at least __GFP_WAIT, aren't they?
> Wherever it is that packets go if the local end is tied up and cannot
> accept them instantly. The simple but prob wrong calculation I made for
> evgeniy is: suppose we have 64k sockets, each socket can buffer up to
> 128 packets, and each packet can be up to 16k (roundup for jumboframes)
> large, that makes for 128G of memory. This calculation is wrong on
> several points (we can have >64k sockets, and I have no idea on the 128)
> but the order of things doesn't get better.

TCP memory is limited for all sockets - it is tcp_*mem parameters.
tcp_mem max on my amd64 with 1gb of ram is 768 kb for _all_ sockets.

Evgeniy Polyakov
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