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

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From: Corey Minyard <minyard@...>

To: David Miller <davem@...>

Cc: <dada1@...>, <linux-kernel@...>, <netdev@...>, <shemminger@...>, <paulmck@...>

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

Date: Monday, October 6, 2008 - 7:08 pm

David Miller wrote:
quoted text> From: Eric Dumazet <dada1@cosmosbay.com>
> Date: Mon, 06 Oct 2008 23:22:31 +0200
>
>   
>> Me wondering what impact this synchronize_rcu() can have on mono-threaded
>> VOIP applications using lot of UDP sockets. What is the maximum delay of
>> this function ?
>>     
>
> 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.
>
>   
Would using SLAB_DESTROY_BY_RCU be ok, or would that be too expensive?

-corey
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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)

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