On Tue, 15 Aug 2006, Evgeniy Polyakov wrote:

On Tue, Aug 15, 2006 at 03:49:28PM +0200, Peter Zijlstra (a.p.zijlstra@chello.nl) wrote:

quoted

It could if you can provide adequate detection of memory pressure and
fallback to a degraded mode within the same allocator/stack and can
guarantee limited service to critical parts.

It is not needed, since network allocations are separated from main
system ones.
I think I need to show an example here.

Let's main system works only with TCP for simplicity.
Let's maximum allowed memory is limited by 1mb (it is 768k on machine
with 1gb of ram).

The maximum amount of memory available for TCP on a system with 1 GB
of memory is 768 MB (not 768 KB).

[bill@chance4 ~]$ cat /proc/meminfo
MemTotal:      1034924 kB
...

[bill@chance4 ~]$ cat /proc/sys/net/ipv4/tcp_mem
98304   131072  196608

Since tcp_mem is in pages (4K in this case), maximum TCP memory
is 196608*4K or 768 MB.

Or am I missing something obvious.

						-Bill