netdev - Re: Linux Route Cache performance tests

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Date:	Sun, 06 Nov 2011 22:57:39 +0100
From:	Paweł Staszewski <pstaszewski@...are.pl>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Linux Network Development list <netdev@...r.kernel.org>
Subject: Re: Linux Route Cache performance tests

W dniu 2011-11-06 22:26, Eric Dumazet pisze:
> 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 ?
no it is 64bit :)
Linux localhost 3.1.0 #16 SMP Sun Nov 6 18:09:48 CET 2011 x86_64 Intel(R)
:)

> If so, you need to tweak alloc_large_system_hash() to use vmalloc,
> because you hit MAX_ORDER (10) page allocations.
funny then :)
Maybee i turned off too many kernel features
> 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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