RE: TCP Transfers slowing down

jcoene_at_gotfrag.com

To: "'Mike Tancsa'" <mike@sentex.net>, <freebsd-performance@freebsd.org>
Date: Mon, 15 Aug 2005 01:36:18 -0400


--
>From a FreeBSD Machine:
root@xxx.xxx.xxx> netstat -ni
Name    Mtu Network       Address              Ipkts Ierrs    Opkts Oerrs
Coll
em0    1500 <Link#1>      00:0c:76:81:8d:f4 214153777     0 90481655     0
0
em0    1500 10.54.54/24   10.54.54.64       213309137     - 90480476     -
-
em0    1500 fe80:1::20c:7 fe80:1::20c:76ff:        0     -        5     -
-
fxp0   1500 <Link#2>      00:0c:76:81:8d:f5 135087023     1 214628700     1
0
fxp0   1500 66.208.110/24 66.208.110.64     127803193     - 214627883     -
-
fxp0   1500 fe80:2::20c:7 fe80:2::20c:76ff:        0     -        5     -
-
lo0   16384 <Link#3>                           17472     0    17472     0
0
lo0   16384 127           127.0.0.1            17472     -    17472     -
-
lo0   16384 ::1/128       ::1                      0     -        0     -
-
lo0   16384 fe80:3::1/64  fe80:3::1                0     -        0     -
-
pflog 33208 <Link#4>                               0     0        0     0
0
root@xxx.xxx.xxx> ifconfig fxp0
fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        options=8<VLAN_MTU>
        inet 66.208.110.64 netmask 0xffffff00 broadcast 66.208.110.255
        inet6 fe80::20c:76ff:fe81:8df5%fxp0 prefixlen 64 scopeid 0x2
        ether 00:0c:76:81:8d:f5
        media: Ethernet 100baseTX <full-duplex>
        status: active
>From the Cisco:
xxx.xxx.xxx#show int fa0/4
FastEthernet0/4 is up, line protocol is up (connected)
  Hardware is Fast Ethernet, address is 000b.5fb7.b204 (bia 000b.5fb7.b204)
  Description: Web Server 4
  MTU 1500 bytes, BW 100000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 3/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s
  input flow-control is off, output flow-control is off
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue :0/40 (size/max)
  5 minute input rate 1406000 bits/sec, 100 packets/sec
  5 minute output rate 57000 bits/sec, 71 packets/sec
     1118722925 packets input, 2492078882 bytes, 0 no buffer
     Received 3702 broadcasts, 0 runts, 0 giants, 0 throttles
     3 input errors, 0 CRC, 3 frame, 0 overrun, 25144 ignored
     0 watchdog, 13 multicast, 0 pause input
     0 input packets with dribble condition detected
     720143589 packets output, 549572280 bytes, 0 underruns
     0 output errors, 0 collisions, 2 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out
xxx.xxx.xxx#show run
<snip>
!
interface FastEthernet0/4
 description Web Server 4
 no ip address
 duplex full
 speed 100
!
<snip>
> -----Original Message-----
> From: Mike Tancsa [mailto:mike@sentex.net]
> Sent: Monday, August 15, 2005 12:30 AM
> To: Jason Coene; freebsd-performance@freebsd.org
> Subject: Re: TCP Transfers slowing down
> 
> At 04:37 PM 14/08/2005, Jason Coene wrote:
> >Before the update, the servers would sustain high transfer rates (well
> over
> >4 Mbyte/sec), but since the update that has changed.  A transfer will
> start
> >out at normal speed (as high as we've ever seen), but it will immediately
> >and consistently drop to between 200 and 300 KByte/sec.  It will stay
> >constant at that speed for the duration of the connection.
> 
> Can you post
> netstat -ni
> ifconfig fxp0
> and a
> show int fa0/<whatever the switch port is>
> as well as fa0/<whatever the switch port is config>
> 
> 
>          ---Mike

RE: TCP Transfers slowing down

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