netdev - Re: Linux Route Cache performance tests

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Message-ID: <1320614788.6506.38.camel@edumazet-laptop>
Date:	Sun, 06 Nov 2011 22:26:28 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Paweł Staszewski <pstaszewski@...are.pl>
Cc:	Linux Network Development list <netdev@...r.kernel.org>
Subject: Re: Linux Route Cache performance tests

Le dimanche 06 novembre 2011 à 21:25 +0100, Paweł Staszewski a écrit :
> Yes with this is a little problem i think with kernel 3.1 because
> dmesg | egrep  '(rhash)|(route)'
> [    0.000000] Command line: root=/dev/md2 rhash_entries=2097152
> [    0.000000] Kernel command line: root=/dev/md2 rhash_entries=2097152
> [    4.697294] IP route cache hash table entries: 524288 (order: 10, 
> 4194304 bytes)
> 
> 

Dont tell me you _still_ use a 32bit kernel ?

If so, you need to tweak alloc_large_system_hash() to use vmalloc,
because you hit MAX_ORDER (10) page allocations.

But considering LOWMEM is about 700 Mbytes, you wont be able to create a
lot of route cache entries.

Come on, do us a favor, and enter new era of computing.



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