netdev - Re: [net-next 3/7] openvswitch: Enable memory mapped Netlink i/o

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Message-ID: <20131130123549.GH2067@breakpoint.cc>
Date:	Sat, 30 Nov 2013 13:35:49 +0100
From:	Florian Westphal <fw@...len.de>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	jesse@...ira.com, davem@...emloft.net, dev@...nvswitch.org,
	netdev@...r.kernel.org, dborkman@...hat.com, ffusco@...hat.com,
	fleitner@...hat.com, eric.dumazet@...il.com,
	bhutchings@...arflare.com
Subject: Re: [net-next 3/7] openvswitch: Enable memory mapped Netlink i/o

Thomas Graf <tgraf@...g.ch> wrote:
> Benchmark
>   * pktgen -> ovs internal port
>   * 5M pkts, 5M flows
>   * 4 threads, 8 cores
> 
> Before:
> Result: OK: 67418743(c67108212+d310530) usec, 5000000 (9000byte,0frags)
>   74163pps 5339Mb/sec (5339736000bps) errors: 0
[..]
> After:
> Result: OK: 24229690(c24127165+d102524) usec, 5000000 (9000byte,0frags)
>   206358pps 14857Mb/sec (14857776000bps) errors: 0

I'm curious.  Is the 'old' value with skb_zerocopy() or without?
Does ovs-vswitchd 'read-access' the entire packet or just e.g. the
header?

I ask because in netfilter nfqueue tests I could not see any difference
between 'zerocopy' vs. mmap in the receive-path tests I made a while
back.

[ I have no objections to your patch, of course ].
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