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From: Andy Lutomirski <>
To: Eric Dumazet <>
Cc: Soheil Hassas Yeganeh <>,
	Eric Dumazet <>,
	"David S. Miller" <>,
	Network Development <>,
	Andrew Lutomirski <>,
	LKML <>,
	Linux-MM <>
Subject: Re: [PATCH v2 net-next 0/2] tcp: mmap: rework zerocopy receive
Date: Thu, 26 Apr 2018 21:16:55 +0000	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

At the risk of further muddying the waters, there's another minor tweak
that could improve performance on certain workloads.  Currently you mmap()
a range for a given socket and then getsockopt() to receive.  If you made
it so you could mmap() something once for any number of sockets (by
mmapping /dev/misc/tcp_zero_receive or whatever), then the performance of
the getsockopt() bit would be identical, but you could release the mapping
for many sockets at once with only a single flush.  For some use cases,
this could be a big win.

You could also add this later easily enough, too.

  reply	other threads:[~2018-04-26 21:17 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-25 21:43 Eric Dumazet
2018-04-25 21:43 ` [PATCH v2 net-next 1/2] tcp: add TCP_ZEROCOPY_RECEIVE support for " Eric Dumazet
2018-04-26 13:40   ` Ka-Cheong Poon
2018-04-26 13:47     ` Eric Dumazet
2018-04-27  8:44   ` kbuild test robot
2018-04-27 13:03     ` Eric Dumazet
2018-04-25 21:43 ` [PATCH v2 net-next 2/2] selftests: net: tcp_mmap must use TCP_ZEROCOPY_RECEIVE Eric Dumazet
2018-04-26  1:20 ` [PATCH v2 net-next 0/2] tcp: mmap: rework zerocopy receive Soheil Hassas Yeganeh
2018-04-26 14:56   ` Eric Dumazet
2018-04-26 21:16     ` Andy Lutomirski [this message]
2018-04-26 21:40       ` Eric Dumazet

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