linux-kernel - Re: Packet timestamps (was: Re: Network performance degradation from 2.6.11.12 to 2.6.16.20)

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Message-ID: <20070306181459.GA12037@tentacle.sectorb.msk.ru>
Date:	Tue, 6 Mar 2007 21:15:00 +0300
From:	"Vladimir B. Savkin" <master@...torb.msk.ru>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	netdev@...r.kernel.org, Andi Kleen <ak@...e.de>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	David Miller <davem@...emloft.net>, hawk@...u.dk,
	harry@...os.washington.edu, linux-kernel@...r.kernel.org,
	Rick Jones <rick.jones2@...com>
Subject: Re: Packet timestamps (was: Re: Network performance degradation from 2.6.11.12 to 2.6.16.20)

On Tue, Mar 06, 2007 at 04:16:24PM +0100, Eric Dumazet wrote:
> 
> It would be better to name the tunable "disable_timestamps", default 0 of 
> course.... 

I agree.
If networking maintainers are interested, I surely can prepare a patch.

But IMO some way to force TSC usage on x86_64 will be even better.

> It would better describe what your patch is actually doing : Even if a tcpdump 
> is running (so asking for timestamps), it wont have them because the sysctl 
> disabled them.

Well, tcpdump will have timestamps, but taken at wrong moment.
But some other applications (that use ip_queue, ulog etc.) will not,
as I understand.

> 
> Thank you
> 
~
:wq
                                        With best regards, 
                                           Vladimir Savkin. 

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