The serial ports are character devices (unbuffered) under Linux. I
don't know if there is any equivalent to the Windows setting or not.
I couldn't find anything about it in the setserial or pppd man
pages, so I'm guessing it does not apply.
--Derek
On Tue, 30 Nov 1999, Hoyt wrote:
> A while back, MaximumPC magazine featured an article on tweaking the Windows
> dial up connection. They worked great for me on my Windows box and, after
> doing some research, were implemented successfully on my Linux boxes.
> Essentially, they are:
>
> 0. A long description in the article on how to determine the optimum mtu.
> 1. Set mtu and mru in /etc/ppp/options to 576 (or use ifconfig ppp0 mtu
> 576).
> 2.Set mss and rwin: route add default gw <ip assigned by your isp> mss 536
> window 2144.
> 3. Turn off IP header compression in /etc/ppp/options using the novj optin.
> 4. Add %C0 and %E0 to modem init string, turning off MNP5 compression and
> auto retrain.
>
> You can look at the respective man pages for details.
>
> One tweak (not from the article, BTW) I cannot figure out how to implement
> is one which increases the cache for the modem. The Windows tweak is as
> follows:
>
> "Modems have a relatively small on-board cache and data buffer. The
> following settings allow the modem to access some of the system RAM to use
> as cache during times of high modem activity. Go into your system.ini file.
> Locate the following: [386Enh]
>
> If your modem is on Com 1, on the line directly below the [386Enh] add this:
>
> Com1Irq4Buffer=1024
>
> If your modem is on Com 2, on the line directly below the [386Enh] add this:
>
> Com2Irq3Buffer=1024
>
> If your modem is on Com 3, on the line directly below the [386Enh] add this:
>
> Com3Irq4Buffer=1024
>
> If your modem is on Com 4, on the line directly below the [386Enh] add this:
>
> Com4Irq3Buffer=1024 "
>
> This tweak resulted in a significant improvement for my Windows box. Any
> ideas on how to implement it in Linux?
>
> Thanks,
> Hoyt
>
>
>
