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To: Kachun Lee <kachun@zippo.com>
cc: freebsd-stable@freebsd.org
Subject: Re: kmem_map full with 2.2beta to 2.2-releng-970422 
In-reply-to: Your message of "Thu, 01 May 1997 09:50:33 -0000."
             <1.5.4.32.19970501095033.006e6dc8@dopey.pathlink.com> 
From: David Greenman <dg@root.com>
Reply-To: dg@root.com
Date: Thu, 01 May 1997 14:05:27 -0700
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>clients, and our NFS servers have quite a lot of these:
>
>  /kernel: nfsd send error 55
>
>They does not seem cause any ill effect. I assume 55=ENOBUFS No buffer space
>available. But I thought with the unified VM/Buffer, there are no MAXBUFFER
>setting any more. Do you know what parameter I should adjust?

   ...that one indicates that network buffers were depleted. This usually
happens when the interface queue reaches it's limit of 50 queued packets,
although it can also happen if the global pool of network buffers is deleted.
The most common cause of this error is a stuck network device driver - some
NICs, for example will stop sending if the cable is unplugged. It can also
happen on PPP/SLIP lines if hardware flow control (CTS) stays de-asserted too
long.

-DG

David Greenman
Core-team/Principal Architect, The FreeBSD Project