Subject: Re: PPP and flow control
To: Michael L. VanLoon -- <>
From: Eric S. Hvozda <>
List: current-users
Date: 01/25/1996 05:34:28
On Wed, 24 Jan 1996 21:19:55 -0800  "Michael L. VanLoon --" wrote:
> There was a go-round mid-late last year about how NetBSD simply
> doesn't service interrupts as quickly as, say, FreeBSD.  I believe
> FreeBSD implemented some kind of virtual-DMA thing in their interrupt
> handler that's supposed to especially help their com (sio) driver.

I put great creedance in this:

Before I upgraded our Inet machine to 1.1 from 1.0, I was seeing 15-20%
Ierrs in netstat on ppp0.  Today, after upgrading to 1.1 I see nearly
0% (0.008% is zero for me).  This machine is a 486DX25 with 16550's
and an IDE disk in it.

Before I could only lock the serial port down at 19200 and still see silo
overflows from hell.  Today, I have in locked down at 115200 and I
see silo overflows infrequently (if at all).