netdev - Re: [PATCH net-next 4/6] kcm: Kernel Connection Multiplexor module

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Message-ID: <20151120232710.GC10508@oracle.com>
Date:	Fri, 20 Nov 2015 18:27:10 -0500
From:	Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:	Tom Herbert <tom@...bertland.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Kernel Team <kernel-team@...com>, davewatson@...com,
	Alexei Starovoitov <alexei.starovoitov@...il.com>
Subject: Re: [PATCH net-next 4/6] kcm: Kernel Connection Multiplexor module

On (11/20/15 15:19), Tom Herbert wrote:
> 
> I did notice that RDS is just creating sglist, but I also noticed that
> this requires allocating "struct rds_message" which holds pointers to
> the sglist, list pointers for a queue, etc. This looks to me like its
> emulating skbuffs anyway. I haven't looked if there's performance

yes, some of that might come from the IB origins of the code
so that it could be shared with an IB transport. I was just wondering
if directly using sk_buffs would be a significant perf win for rds-tcp.

> issues otherwise in using the fraglist. It might be interesting if
> there was an interface to send skbufs on a kernel socket.

yes. Or if there was a way to  factor out the non-zero page-order
enhancements in skb_page_frag_refill in a way that they could be
shared with RDS.

--Sowmini

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