netdev - [PATCH next-next-2.6] netdev: better dev_name

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Message-Id: <200910252158.53921.opurdila@ixiacom.com>
Date:	Sun, 25 Oct 2009 21:58:53 +0200
From:	Octavian Purdila <opurdila@...acom.com>
To:	netdev@...r.kernel.org
Subject: [PATCH next-next-2.6] netdev: better dev_name_hash


The current dev_name_hash is not very good at spreading entries when a
large number of interfaces of the same type (e.g. ethXXXXX) are used.

Here are some performance numbers for creating 16000 dummy interfaces with
and without the patch (with per device sysctl entries disabled)

    With patch                      Without patch

    real    0m 2.27s                real    0m 4.32s
    user    0m 0.00s                user    0m 0.00s
    sys     0m 1.13s                sys     0m 2.16s

Signed-off-by: Octavian Purdila <opurdila@...acom.com>
---
 net/core/dev.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

View attachment "5504c10b4f96275a4b60d0705f71614b6eba6b5c.diff" of type "text/x-patch" (524 bytes)