netdev - RE: [PATCH net-next v2 1/8] tipc: decrease connection flow control window

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Message-ID: <A2BAEFC30C8FD34388F02C9B3121859D1C251322@eusaamb103.ericsson.se>
Date:	Wed, 14 May 2014 12:12:35 +0000
From:	Jon Maloy <jon.maloy@...csson.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	"Erik Hugne" <erik.hugne@...csson.com>,
	"ying.xue@...driver.com" <ying.xue@...driver.com>,
	"maloy@...jonn.com" <maloy@...jonn.com>,
	"tipc-discussion@...ts.sourceforge.net" 
	<tipc-discussion@...ts.sourceforge.net>
Subject: RE: [PATCH net-next v2 1/8] tipc: decrease connection flow control
 window



> -----Original Message-----
> From: Eric Dumazet [mailto:eric.dumazet@...il.com]
> Sent: May-14-14 7:51 AM
> To: Jon Maloy
> Cc: davem@...emloft.net; netdev@...r.kernel.org; Paul Gortmaker; Erik
> Hugne; ying.xue@...driver.com; maloy@...jonn.com; tipc-
> discussion@...ts.sourceforge.net
> Subject: Re: [PATCH net-next v2 1/8] tipc: decrease connection flow control
> window
> 
> On Wed, 2014-05-14 at 05:39 -0400, Jon Maloy wrote:
> > Memory overhead when allocating big buffers for data transfer may be
> > quite significant. E.g., truesize of a 64 KB buffer turns out to be
> > 132 KB, 2 x the requested size.
> 
> It might be time to use a different strategy for skb allocations then ?

Absolutely. That is already ongoing. See my answer to David M about this.

///jon

> 
> Is this because TIPC does not support SG ?
>