Date: Thu, 1 Mar 2007 11:30:44 +0000 (GMT) From: Robert Watson <rwatson@FreeBSD.org> To: Lars Erik Gullerud <lerik@nolink.net> Cc: performance@FreeBSD.org Subject: Re: MFC of UDP socket enhancement for BIND? Message-ID: <20070301111957.S13593@fledge.watson.org> In-Reply-To: <20070218185837.R16107@electra.nolink.net> References: <20070216223258.S16107@electra.nolink.net> <20070216221505.D73842@fledge.watson.org> <20070218185837.R16107@electra.nolink.net>
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On Sun, 18 Feb 2007, Lars Erik Gullerud wrote:
> On Fri, 16 Feb 2007, Robert Watson wrote:
>
>> I can certainly investigate doing this -- since 6.2 is safely out the door
>> it's a good time to do so. I'll follow up by e-mail in a few days -- would
>> it be possible for you to help with testing?
>
> We would of course be most happy to test any patches you come up with, and
> run performance benchmarks on our systems.
It turns out this change comes in two parts:
(1) In the first part, the structure of the socket send routing, sosend(), is
simplified by breaking out the code that copies data from user space from
the code that transmits via the protocol.
(2) In the second part, a version of sosend() specific to datagram protocols
(where the socket send buffer isn't ever used) is added.
I'm going to attach two patches against RELENG_6 from today -- the first
performs only the first step (sosend_copyin.diff), and the second performs
both (sosend_dgram.diff) (so will have to be applied against a fresh version
of uipc_socket.c as opposed to the patched version). The first change
requires heavy stability testing, and the second requires both performance and
stability testing. Any assistance from you in helping to make this a reliable
MFC would be much appreciated.
For reference, the sosend_copyin.diff applies these changes:
src/sys/kern/uipc_socket.c:1.253, 1.254, 1.255
The sosend_dgram.diff patch incrementally also applies these changes on top of
sosend_copyin.diff:
src/sys/kern/uipc_socket.c:1.256
src/sys/netinet/udp_usrreq.c:1.188
I've CC'd the performance list as there is a relevant thread going on there
right now, and other people might also be interested in reviewing and testing
these changes. The short description is that this eliminates a large number
of socket buffer interactions in the UDP send path--one of the effects is to
avoid locking the socket buffer for an extended period, as it's largely unused
in the datagram transmit path. Per the commit comments, this idea was
suggested by Jinmei Tatsuya at ISC as a result of their performance analysis;
this change has been in 7-CURRENT since May of last year and has seen some bug
fixes but no substantial changes in that time, so has been moderately burned
in.
Robert N M Watson
Computer Laboratory
University of Cambridge
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