Date: Sat, 1 Feb 1997 23:34:25 -0600 From: john@dexter.starfire.mn.org (John Lind) To: current@freebsd.org Subject: fast/slow Ethernet NFS problems Message-ID: <Mutt.19970201233424.john@dexter.starfire.mn.org>
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I am having what seems like the classic problem with a fast server and a slow client in that the client makes a request and, judging from the data activity lights on the network, the server is trying to respond, but the client "hangs." I have tried doing the mount with "-r=1024" but this has not helped. The server system is a FreeBSD 2.1.0-R(CD) system with an AMD 5x86-133, 32Mb of RAM, ASUS SC-200 NCD 53C810 SCSI controller, and an NE2000-compatible ISA ethernet adapter. The client system was assembled from my salvage box: i486DX/33, 8Mb RAM, Adaptec 1542B SCSI controller, and an 8-bit 3Com 3C503 controller. I was using this exact same hardware with FreeBSD 2.1.6(.1) on the client in the same configuration, and, with the proper mount parameters, it worked just fine. I have tried many mount variations, including mount -t nfs -o -r=1024 dexter:/home /home mount -t nfs -o -I=1024,-r=1024 dexter:/home /home mount -t nfs -o -I=512,-r=1024,-w=1024 dexter:/home /home but they have all gotten me nowhere. Here is a "netstat -s" output: ip: 67 total packets received 0 bad header checksums 0 with size smaller than minimum 0 with data size < data length 0 with header length < data size 0 with data length < header length 0 with bad options 0 with incorrect version number 24 fragments received 0 fragments dropped (dup or out of space) 0 fragments dropped after timeout 12 packets reassembled ok 55 packets for this host 0 packets for unknown/unsupported protocol 0 packets forwarded 0 packets not forwardable 0 packets received for unknown multicast group 0 redirects sent 56 packets sent from this host 0 packets sent with fabricated ip header 0 output packets dropped due to no bufs, etc. 0 output packets discarded due to no route 0 output datagrams fragmented 0 fragments created 0 datagrams that can't be fragmented icmp: 0 calls to icmp_error 0 errors not generated 'cuz old message was icmp 0 messages with bad code fields 0 messages < minimum length 0 bad checksums 0 messages with bad length 0 message responses generated igmp: 0 messages received 0 messages received with too few bytes 0 messages received with bad checksum 0 membership queries received 0 membership queries received with invalid field(s) 0 membership reports received 0 membership reports received with invalid field(s) 0 membership reports received for groups to which we belong 0 membership reports sent tcp: 30 packets sent 14 data packets (3285 bytes) 0 data packets (0 bytes) retransmitted 0 resends initiated by MTU discovery 14 ack-only packets (10 delayed) 0 URG only packets 0 window probe packets 0 window update packets 2 control packets 21 packets received 15 acks (for 3288 bytes) 1 duplicate ack 0 acks for unsent data 15 packets (1736 bytes) received in-sequence 0 completely duplicate packets (0 bytes) 0 old duplicate packets 0 packets with some dup. data (0 bytes duped) 1 out-of-order packet (0 bytes) 0 packets (0 bytes) of data after window 0 window probes 1 window update packet 0 packets received after close 0 discarded for bad checksums 0 discarded for bad header offset fields 0 discarded because packet too short 1 connection request 1 connection accept 0 bad connection attempts 0 listen queue overflows 2 connections established (including accepts) 4 connections closed (including 0 drops) 0 connections updated cached RTT on close 0 connections updated cached RTT variance on close 0 connections updated cached ssthresh on close 0 embryonic connections dropped 15 segments updated rtt (of 15 attempts) 0 retransmit timeouts 0 connections dropped by rexmit timeout 0 persist timeouts 0 connections dropped by persist timeout 0 keepalive timeouts 0 keepalive probes sent 0 connections dropped by keepalive 0 correct ACK header predictions 3 correct data packet header predictions udp: 34 datagrams received 0 with incomplete header 0 with bad data length field 0 with bad checksum 0 dropped due to no socket 8 broadcast/multicast datagrams dropped due to no socket 12 dropped due to full socket buffers 0 not for hashed pcb 14 delivered 26 datagrams output John Lind, Starfire Consulting Services E-mail: john@starfire.MN.ORG USnail: PO Box 17247, Mpls MN 55417
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