linux-kernel - Re: 2.6.24-rc2: Network commit causes SLUB performance regression with tbench

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Message-Id: <200711140955.03989.nickpiggin@yahoo.com.au>
Date:	Wed, 14 Nov 2007 09:55:03 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	David Miller <davem@...emloft.net>
Cc:	clameter@....com, netdev@...r.kernel.org,
	herbert@...dor.apana.org.au, linux-kernel@...r.kernel.org
Subject: Re: 2.6.24-rc2: Network commit causes SLUB performance regression with tbench

On Wednesday 14 November 2007 09:27, Nick Piggin wrote:

> > 2) Try removing NETIF_F_SG in drivers/net/loopback.c's dev->feastures
> >    setting.
>
> Will try that now.

Doesn't help (with vanilla kernel -- Herbert's patch applied).

data_len histogram drops to 0 and goes to len (I guess that's not
surprising).

Performance is pretty similar (ie. not good).

I'll look at allocator patterns next.
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