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Apply fix from PR2176, edited appropriately

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This commit is contained in:
sommerfe 1999-01-14 00:16:42 +00:00
parent d6797d8b82
commit c09dbe4f28
2 changed files with 52 additions and 3 deletions
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24
share/man/man4/ec.4
View File

@ -1,4 +1,4 @@
.\" $NetBSD: ec.4,v 1.4 1998/08/09 00:39:02 thorpej Exp $
.\" $NetBSD: ec.4,v 1.5 1999/01/14 00:16:42 sommerfe Exp $
.\"
.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -78,6 +78,28 @@ The memory test was unable to clear shared the interface's shared memory
region. This often indicates that the card is configured at a conflicting
.Em iomem
address.
.It ec0: warning - receiver ring buffer overrun
The DP8390 Ethernet chip used by this board implements a shared-memory
ring-buffer to store incoming packets.
The 3c503 usually has only 8k bytes of shared memory. This is only
enough room for about 4 full-size (1500 byte) packets. This can
sometimes be a problem, especially on the original 3c503, because
these boards' shared-memory access speed is quite slow; typically only
about 1MB/second. The overhead of this slow memory access, and the
fact that there is only room for 4 full-sized packets means that the
ring-buffer will occassionally overrun. When this happens, the board
must be reset to avoid a lockup problem in early revision 8390's.
Resetting the board causes all of the data in the ring-buffer to be
lost, requiring it to be retransmitted/received, congesting the board
further. Because of this, maximum throughput on these boards is only
about 400-600k per second.
.Pp
This problem is exasperated by NFS because the 8bit boards lack
sufficient memory to support the default 8k byte packets that NFS and
other protocols use as their default. If these cards must be used
with NFS, use the NFS -r and -w options in /etc/fstab to limit NFS's
packet size. 4096k byte packets generally work.
.El
.Sh SEE ALSO
.Xr ifmedia 4 ,

31
share/man/man4/we.4
View File

@ -1,4 +1,4 @@
.\" $NetBSD: we.4,v 1.4 1998/08/09 00:39:02 thorpej Exp $
.\" $NetBSD: we.4,v 1.5 1999/01/14 00:16:42 sommerfe Exp $
.\"
.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -91,7 +91,34 @@ The memory test was unable to clear shared the interface's shared memory
region. This often indicates that the card is configured at a conflicting
.Em iomem
address.
.El
.It we0: warning - receiver ring buffer overrun
The DP8390 Ethernet chip used by this board implements a shared-memory
ring-buffer to store incoming packets.
The 16bit boards (8013 series) have 16k of memory as well as
fast memory access speed. Typical memory access speed on these
boards is about 4MB/second. These boards generally have no
problems keeping up with full ethernet speed and the ring-buffer
seldom overfills.
However, the 8bit boards (8003) usually have only 8k bytes of shared
memory. This is only enough room for about 4 full-size (1500 byte)
packets. This can sometimes be a problem, especially on the original
WD8003E, because these boards' shared-memory access speed is quite
slow; typically only about 1MB/second. The overhead of this slow
memory access, and the fact that there is only room for 4 full-sized
packets means that the ring-buffer will occassionally overrun. When
this happens, the board must be reset to avoid a lockup problem in
early revision 8390's. Resetting the board causes all of the data in
the ring-buffer to be lost, requiring it to be retransmitted/received,
congesting the board further. Because of this, maximum throughput on
these boards is only about 400-600k per second.
.Pp
This problem is exasperated by NFS because the 8bit boards lack
sufficient memory to support the default 8k byte packets that NFS and
other protocols use as their default. If these cards must be used
with NFS, use the NFS -r and -w options in /etc/fstab to limit NFS's
packet size. 4096k byte packets generally work.
.Sh SEE ALSO
.Xr ifmedia 4 ,
.Xr intro 4 ,