Re: Slow network transfers
From: Scott Burns (scott_at_mirrabooka.com)
Date: 11/26/03
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Date: Wed, 26 Nov 2003 00:39:50 GMT
Mike Brown wrote:
>
>What is the HW, the make and brand of NIC, and the output of
>llistat -l ?
>
>Mike
>
>
>
The machine I have available now is a P3/500 with 128Mb RAM, SCSI
HDDs, and generally me as the only user. My bash prompt turns red when
the load average hits 1, and it has been at least six months since that
happened. I've seen slow network transfers when working on client
machines, mostly of the same vintage, but with twice the RAM. We are
currently running 5.0.5. We almost always use Intel NICs. We used
NetGear for a few machines but found they were not up to scratch. The
curtrent NIC in question is an Intel PRO/100B or PRO/100+ with autosense
speed/duplex.
The short llistat version:
saturn:~# llistat -l > llstat.1
saturn:~# l test.img
-rw-r--r-- 1 root other 11798370 Nov 26 10:14 test.img
saturn:~# time nc -w 1 pluto 9900 < test.img
real 4m34.680s
user 0m0.000s
sys 0m0.720s
saturn:~# llistat -l > llstat.2
saturn:~# diff llstat.1 llstat.2
12,13c12,13
< In: 176608 0 1011 0 51455461 0
< Out: 176649 0 345 0 36680514 0
---
> In: 186061 0 1055 0 52056589 0
> Out: 188207 0 365 0 50732683 0
16c16
< 186 frames received destined for an unbound SAP
---
> 191 frames received destined for an unbound SAP
23c23
< Last send time: 591544
---
> Last send time: 628854
saturn:~# uptime
10:21am up 1:45, 9 users, load average: 0.00, 0.00, 0.00
saturn:~#
The long llistat version (llistat.2)
Device MAC address in use Factory MAC Address
------ ------------------ -------------------
/dev/net0 00:90:27:b2:5a:6e 00:90:27:b2:5a:6e
Multicast address table
-----------------------
01:00:5e:00:00:01
FRAMES
Unicast Multicast Broadcast Error Octets Queue Length
---------- --------- --------- ------ ----------- ------------
In: 186061 0 1055 0 52056589 0
Out: 188207 0 365 0 50732683 0
DLPI Module Info: 2 SAPs open, 18 SAPs maximum
191 frames received destined for an unbound SAP
MAC Driver Info: Media_type: Ethernet
Min_SDU: 1, Max_SDU: 1514, Address length: 6
Interface speed: 100 Mbits/sec
DLPI Restarts Info: Last queue size: 0
Last send time: 628854
Restart in progress: 0
Number of restarts: 0
Interface Version: MDI 100
ETHERNET SPECIFIC STATISTICS
Collision Table - The number of frames successfully transmitted,
but involved in at least one collision:
Frames Frames
------- -------
1 collision 0 9 collisions 0
2 collisions 0 10 collisions 0
3 collisions 0 11 collisions 0
4 collisions 0 12 collisions 0
5 collisions 0 13 collisions 0
6 collisions 0 14 collisions 0
7 collisions 0 15 collisions 0
8 collisions 0 16 collisions 0
Bad Alignment 0 Number of frames received that were
not an integral number of octets
FCS Errors 0 Number of frames received that did
not pass the Frame Check Sequence
SQE Test Errors 0 Number of Signal Quality Error Test
signals that were detected by the
adapter
Deferred Transmissions 0 Number of frames delayed on the
first transmission attempt because
the media was busy
Late Collisions 0 Number of times a collision was
detected later than 512 bits into
the transmitted frame
Excessive Collisions 0 Number of frames dropped on
transmission
because of excessive collisions
Internal MAC Transmit 0 Number of frames dropped on
transmission
Errors because of errors not covered above
Carrier Sense Errors 0 Number of times that the carrier sense
condition was lost when attempting to
send a frame that was deferred for an
excessive amount of time
Frame Too Long 0 Number of frames dropped on reception
because they were larger than the
maximum Ethernet frame size
Internal MAC Receive 0 Number of frames dropped on reception
Errors because of errors not covered above
Spurious Interrupts 0 Number of times the adapter interrupted
the system for an unknown reason
No STREAMS Buffers 0 Number of frames dropped on reception
because no STREAMS buffers were
available
Underruns/Overruns 7 Number of times the transfer of
data to or from the frame buffer
did not complete successfully
Device Timeouts 0 Number of times the adapter failed to
respond to a request from the driver
--
Scott Burns
Mirrabooka Systems
Tel +61 7 3857 7899
Fax +61 7 3857 1368
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