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Re: [PATCH 3/3] Convert the UDP hash lock to RCU

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From: David Miller <davem@...>
To: <dada1@...>
Cc: <minyard@...>, <linux-kernel@...>, <netdev@...>, <shemminger@...>, <paulmck@...>
Subject: Re: [PATCH 3/3] Convert the UDP hash lock to RCU
Date: Monday, October 6, 2008 - 5:40 pm

From: Eric Dumazet <dada1@cosmosbay.com>
Date: Mon, 06 Oct 2008 23:22:31 +0200


The cost is enormous, we really can't use it here.

I have a patch that did top-level socket destruction using RCU,
and that didn't use synchronize_rcu(), and that killed connection
rates by up to %20.

I can only imagine what the cost would be if I had to add such a call
in there.

Really, I can't consider these changes seriously, as-is.
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Messages in current thread:
[PATCH 3/3] Convert the UDP hash lock to RCU, Corey Minyard, (Mon Oct 6, 2:50 pm)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Eric Dumazet, (Mon Oct 6, 5:22 pm)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Peter Zijlstra, (Tue Oct 7, 4:17 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Eric Dumazet, (Tue Oct 7, 5:24 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Christoph Lameter, (Tue Oct 7, 10:15 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Eric Dumazet, (Tue Oct 7, 10:50 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Christoph Lameter, (Tue Oct 7, 11:23 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Peter Zijlstra, (Tue Oct 7, 11:09 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Paul E. McKenney, (Tue Oct 7, 11:05 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Paul E. McKenney, (Tue Oct 7, 10:38 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Corey Minyard, (Mon Oct 6, 6:07 pm)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, David Miller, (Mon Oct 6, 5:40 pm)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Peter Zijlstra, (Tue Oct 7, 4:31 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, David Miller, (Tue Oct 7, 2:29 pm)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Paul E. McKenney, (Tue Oct 7, 10:36 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Eric Dumazet, (Tue Oct 7, 1:24 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, David Miller, (Tue Oct 7, 2:26 pm)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Eric Dumazet, (Wed Oct 8, 4:35 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, David Miller, (Wed Oct 8, 12:38 pm)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Benny Amorsen, (Tue Oct 7, 4:54 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Eric Dumazet, (Tue Oct 7, 8:59 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Corey Minyard, (Tue Oct 7, 12:43 pm)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Stephen Hemminger, (Tue Oct 7, 10:07 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, David Miller, (Tue Oct 7, 4:55 pm)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Eric Dumazet, (Wed Oct 8, 9:55 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, David Miller, (Wed Oct 8, 2:45 pm)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Stephen Hemminger, (Tue Oct 7, 5:20 pm)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Corey Minyard, (Mon Oct 6, 7:08 pm)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Evgeniy Polyakov, (Tue Oct 7, 4:37 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Christoph Lameter, (Tue Oct 7, 10:16 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Evgeniy Polyakov, (Tue Oct 7, 10:29 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Christoph Lameter, (Tue Oct 7, 10:38 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Paul E. McKenney, (Tue Oct 7, 10:33 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Christoph Lameter, (Tue Oct 7, 10:45 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Paul E. McKenney, (Tue Oct 7, 11:07 am)
Re: [PATCH 3/3] Convert the UDP hash lock to RCU, Eric Dumazet, (Tue Oct 7, 11:07 am)