Date: Wed, 16 Aug 1995 01:04:49 +0200 From: Marc van Kempen <wmbfmk@urc.tue.nl> To: davidg@Root.COM Cc: Marc van Kempen <wmbfmk@urc.tue.nl>, questions@freebsd.org Subject: Re: funny network speeds Message-ID: <199508152304.BAA13898@nietzsche> In-Reply-To: davidg's message of Wed, 09 Aug 1995 19:06:53 -0700. <199508100206.TAA00447@corbin.Root.COM>
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> >I notice a strange difference in the network speed, wether
> >I upload something with ftp, or download it.
> ...
> >WD8013EPC (zola)
> ...
> >3c509 (nietzsche)
>
> Interesting...I don't know off hand where the problem is, but it appears to
> be dropping packets. If you could look at the netstat -i statistics on both
> machines, this would help. netstat -s might also help.
>
> -DG
I installed 2.0.5 on nietzsche to see if it made a difference. Both
are 2.0.5 now. Performance
seems to be a little bit better now, but fluctuates more. ftp'ing from
zola to nietzsche still gives the worst performance, but fluctuates
between 100k/s and 500k/s. When I look at the flow of the hashmarks,
then going from zola->nietzsche there is still a break in the flow,
going from nietzsche->zola the flow is steady.
Here's the output from netstat -i after the kernel has been copied
between the two machines several times (10-20 times):
nietzsche:
Name Mtu Network Address Ipkts Ierrs Opkts Oerrs
Coll
ed0 1500 <Link>00.00.c0.40.9c.56 9441 0 7811 0
25
ed0 1500 192.168.1 nietzsche 9441 0 7811 0
25
lp0* 1500 <Link> 0 0 0 0
0
lo0 16384 <Link> 379 0 379 0
0
lo0 16384 your-net localhost 379 0 379 0
0
sl0* 552 <Link> 0 0 0 0
0
tun0* 1500 <Link> 2741 0 2900 0
0
zola:
Name Mtu Network Address Ipkts Ierrs Opkts Oerrs
Coll
lp0* 1500 <Link> 0 0 0 0
0
ep0 1500 <Link>00.20.af.27.6e.66 151904 0 110125 3
0
ep0 1500 192.168.1 zola 151904 0 110125 3
0
lo0 16384 <Link> 730 0 730 0
0
lo0 16384 your-net localhost 730 0 730 0
0
sl0* 552 <Link> 0 0 0 0
0
tun0* 1500 <Link> 0 0 0 0
0
and the output from netstat -s
nietzsche:
ip:
12569 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
0 fragments received
0 fragments dropped (dup or out of space)
0 fragments dropped after timeout
0 packets reassembled ok
12397 packets for this host
172 packets for unknown/unsupported protocol
0 packets forwarded
0 packets not forwardable
0 redirects sent
11540 packets sent from this host
0 packets sent with fabricated ip header
0 output packets dropped due to no bufs, etc.
440 output packets discarded due to no route
0 output datagrams fragmented
0 fragments created
0 datagrams that can't be fragmented
icmp:
174 calls to icmp_error
0 errors not generated 'cuz old message was icmp
Output histogram:
destination unreachable: 174
0 messages with bad code fields
0 messages < minimum length
0 bad checksums
0 messages with bad length
Input histogram:
echo reply: 5
destination unreachable: 171
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:
10673 packets sent
4876 data packets (6074172 bytes)
37 data packets (4078 bytes) retransmitted
2386 ack-only packets (2038 delayed)
0 URG only packets
0 window probe packets
3246 window update packets
205 control packets
12170 packets received
2628 acks (for 6074207 bytes)
160 duplicate acks
0 acks for unsent data
9624 packets (12683906 bytes) received in-sequence
130 completely duplicate packets (47037 bytes)
0 old duplicate packets
4 packets with some dup. data (59 bytes duped)
14 out-of-order packets (0 bytes)
0 packets (0 bytes) of data after window
0 window probes
209 window update packets
5 packets received after close
0 discarded for bad checksums
0 discarded for bad header offset fields
0 discarded because packet too short
110 connection requests
61 connection accepts
102 connections established (including accepts)
236 connections closed (including 3 drops)
2 embryonic connections dropped
2601 segments updated rtt (of 2616 attempts)
66 retransmit timeouts
2 connections dropped by rexmit timeout
0 persist timeouts
0 keepalive timeouts
0 keepalive probes sent
0 connections dropped by keepalive
625 correct ACK header predictions
9011 correct data packet header predictions
0 PCB cache misses
udp:
223 datagrams received
0 with incomplete header
0 with bad data length field
0 with bad checksum
174 dropped due to no socket
0 broadcast/multicast datagrams dropped due to no socket
0 dropped due to full socket buffers
49 delivered
588 datagrams output
zola:
ip:
152612 total packets received
0 bad header checksums
0 with size smaller than minimum
7 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
21016 fragments received
0 fragments dropped (dup or out of space)
2 fragments dropped after timeout
3531 packets reassembled ok
134783 packets for this host
337 packets for unknown/unsupported protocol
0 packets forwarded
0 packets not forwardable
0 redirects sent
109944 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
696 output datagrams fragmented
989 fragments created
0 datagrams that can't be fragmented
icmp:
336 calls to icmp_error
0 errors not generated 'cuz old message was icmp
Output histogram:
destination unreachable: 336
0 messages with bad code fields
0 messages < minimum length
0 bad checksums
0 messages with bad length
Input histogram:
echo reply: 2
destination unreachable: 337
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:
99897 packets sent
84099 data packets (65215970 bytes)
2 data packets (1980 bytes) retransmitted
13624 ack-only packets (13551 delayed)
1 URG only packet
49 window probe packets
2032 window update packets
90 control packets
118509 packets received
80347 acks (for 65215185 bytes)
36 duplicate acks
0 acks for unsent data
39439 packets (8618339 bytes) received in-sequence
5 completely duplicate packets (864 bytes)
0 old duplicate packets
0 packets with some dup. data (0 bytes duped)
54 out-of-order packets (1240 bytes)
1 packet (0 bytes) of data after window
0 window probes
984 window update packets
0 packets received after close
0 discarded for bad checksums
0 discarded for bad header offset fields
0 discarded because packet too short
52 connection requests
14 connection accepts
59 connections established (including accepts)
66 connections closed (including 2 drops)
6 embryonic connections dropped
80347 segments updated rtt (of 62989 attempts)
2 retransmit timeouts
0 connections dropped by rexmit timeout
0 persist timeouts
6 keepalive timeouts
0 keepalive probes sent
0 connections dropped by keepalive
32212 correct ACK header predictions
15545 correct data packet header predictions
0 PCB cache misses
udp:
16273 datagrams received
0 with incomplete header
0 with bad data length field
0 with bad checksum
336 dropped due to no socket
0 broadcast/multicast datagrams dropped due to no socket
17 dropped due to full socket buffers
15920 delivered
9703 datagrams output
Thanks for looking this far,
Marc.
----------------------------------------------------
Marc van Kempen wmbfmk@urc.tue.nl
He's dead Jim ..., kick him if you don't believe me.
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