From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: Linux Route Cache performance tests
Date: Sun, 06 Nov 2011 22:26:28 +0100
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To: =?UTF-8?Q?Pawe=C5=82?= Staszewski <pstaszewski@itcare.pl>
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Le dimanche 06 novembre 2011 =C3=A0 21:25 +0100, Pawe=C5=82 Staszewski =
a =C3=A9crit :
> Yes with this is a little problem i think with kernel 3.1 because
> dmesg | egrep  '(rhash)|(route)'
> [    0.000000] Command line: root=3D/dev/md2 rhash_entries=3D2097152
> [    0.000000] Kernel command line: root=3D/dev/md2 rhash_entries=3D2=
097152
> [    4.697294] IP route cache hash table entries: 524288 (order: 10,=20
> 4194304 bytes)
>=20
>=20

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.