From: Eric Dumazet <dada1@cosmosbay.com>
Date: Fri, 18 Jan 2008 12:30:21 +0000 (-0800)
Subject: [IPV4] FIB_HASH : Avoid unecessary loop in fn_hash_dump_zone()
X-Git-Tag: v2.6.24~26^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8d3f099abe25c21670cb5728178a1f286952782d;p=pandora-kernel.git

[IPV4] FIB_HASH : Avoid unecessary loop in fn_hash_dump_zone()

I noticed "ip route list" was slower than "cat /proc/net/route" on a
machine with a full Internet routing table (214392 entries : Special
thanks to Robert ;) )

This is similar to problem reported in commit
d8c9283089287341c85a0a69de32c2287a990e71 ("[IPV4] ROUTE: ip_rt_dump()
is unecessary slow")

Fix is to avoid scanning the begining of fz_hash table, but directly
seek to the right offset.

Before patch :

time ip route >/tmp/ROUTE

real    0m1.285s
user    0m0.712s
sys     0m0.436s

After patch

# time ip route >/tmp/ROUTE

real    0m0.835s
user    0m0.692s
sys     0m0.124s

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

Reading git-diff-tree failed