[Python-Dev] very bad network performance

[Ralf Schmitt]

On Mon, Apr 21, 2008 at 8:10 PM, Gregory P. Smith <greg at krypto.org> wrote:

>
>
>
> The 64K hunch is wrong.  The system limit can be found using
> getsockopt(...SO_RCVBUF...).  It can easily be (and often is) set to many
> megabytes either at a system default level or on a per socket level by the
> user using setsockopt.  When the system default is that large, limiting by
> the system limit would not help the 10mb read case.
>

but it would help in the 100mb read case.


>
> Even smaller allocations like 64K cause problems as mentioned in issue
> 1092502 linking to this twisted http://twistedmatrix.com/trac/ticket/1079bug.  twisted's solution was to make the string object returned by a recv as
> short lived as possible by copying it into a StringIO.  We could do the same
> in _fileobject.read() and readline().
>

this approach look reasonable to me.

- Ralf
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-dev/attachments/20080422/990b817b/attachment.htm>