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Date: Mon, 07 Jul 2014 10:10:00 -0000
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: Severe performance degradation of writev
Message-ID: <20140707101049.GI1803@calimero.vinschen.de>
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On Jul  7 07:28, jojelino wrote:
> 2008-07-27  Corinna Vinschen  <corinna@vinschen.de>
>=20
>        * fhandler_socket.cc (fhandler_socket::send_internal): Send never
> more
>        then 64K bytes at once.  For blocking sockets, loop until entire d=
ata
>        has been sent or an error occurs.
>        (fhandler_socket::sendto): Drop code which sends on 64K bytes.
>        (fhandler_socket::sendmsg): Ditto.
>=20
> This commit added workaround for KB823764. but it has brought another
> performance issue when writev sends <64k of data.

That's why the code contains that FIXME comment.  If you have a good
idea for simple code to split a message into the least number of pieces
to minimize the number of WsaSendTo calls...


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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