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From: Simon Horman <>
To: Sven Wegener <>
Subject: Re: [PATCH] ipvs: Make the synchronization interval controllable
Date: Thu, 7 Feb 2008 13:28:09 +0900	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Thu, Feb 07, 2008 at 12:57:43AM +0100, Sven Wegener wrote:
> The default synchronization interval of 1000 milliseconds is too high for a
> heavily loaded director. Collecting the connection information from one second
> and then sending it out in a burst will overflow the socket buffer and lead to
> synchronization information being dropped. Make the interval controllable by a
> sysctl variable so that users can tune it. We enforce a lower limit of 0 and an
> upper limit of 2000 ms on the interval. A too large interval can make the
> synchronization buffer consume too much memory and will also delay the exit of
> the kernel threads.
> Signed-off-by: Sven Wegener <>

Hi Sven,

I have no problems with the spirit of this patch, and the range checking
seems good to me.  Though I wonder if 2000 might not be an exessively
low maximum.  I can't think of a usage case off-hand, but I'm not sure I
understand why a user shouldn't be able to set it to much (rediculously)
higher values.

In any case, thats not a big deal.

Acked-by: Simon Horman <>

> ---
> Changes from the last version include the addition of the range enforcement.
> Also place the definitions of the variables where all other ipvs sysctl
> variables are.


  reply	other threads:[~2008-02-07  4:28 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-06 21:39 Sven Wegener
2008-02-06 22:09 ` David Rientjes
2008-02-06 23:12   ` Sven Wegener
2008-02-06 23:57     ` Sven Wegener
2008-02-07  4:28       ` Simon Horman [this message]
2008-02-07  6:54     ` David Rientjes
2008-02-08 14:23 ` Andi Kleen
2008-02-08 15:57   ` Krzysztof Oledzki

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