Re: pty(4) 1024 bytes buffer limit

[christos%astron.com@localhost (Christos Zoulas)]

In article <201109081526.p88FQT1Q002489%ginseng.pulsar-zone.net@localhost>,
Matthew Mondor  <mm_lists%pulsar-zone.net@localhost> wrote:
>Hello,
>
>I've been wondering if it was possible to change the pty(4) internal
>buffer size, as I noticed that ppp tunnels cannot use a larger frame
>size.  Because of this, it seems that the optimal MTU be 856, which is
>so small that context switches become the bottleneck.
>
>It would be nice to for instance be able to use an MTU of 3000 so that
>there are less context switches, but unfortunately tracing the
>processes show that 1024 bytes are read from the pty devices at most.
>
>I looked at the various tty(4) termios(4) and pty(4) without finding an
>option to change the buffer size.  Is there a way at all to change it?
>

Please file a PR about this. I've been meaning to fix it.

christos