httpd-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Brian Behlendorf <>
Subject Re: potential Apache performance problem: size of the TCP send buffer
Date Sun, 03 Nov 1996 22:55:07 GMT

This patch looks good to me - a patch against the current cvs tree is appended.
Any other +1's?


On Mon, 28 Oct 1996, John Heidemann wrote:
> Apache-1.1.1 doesn't appear to set the size of the TCP send buffer.
> On many systems the default send-buffer size is too small to support
> full-rate transfer over high bandwidth-delay-product networks (such as
> cross-US Internet traffic).  For example, a 100ms round-trip time
> (typical cross-US latency) and a 4kB default buffer size (common to
> many OSes such as SunOS) limit transfer rate to 40kB/s.
> Much better cross-US transfer rates are possible between
> well-connected hosts if the send buffer size is increased.  A patch at
> <>
> implements the SendBufferSize directive to allow Apache to have a
> configurable buffer size.
> A complete description of this directive is in the file
> send_buffer_size.html which accompanies the patch.  For a pointer to
> other patches, see <>.  For
> descriptions of the problems motivating these patches, see
> <>.  [For
> those of you who have seen this web page before, there are some new
> figures in ``The Performance Problems'' section and the buffer-size
> problem is described under ``Other Problems'' there.]
>    -John Heidemann
>     USC/ISI


View raw message