----- Original Message -----
From: "Jin Guojun (VFFS)" <[EMAIL PROTECTED]>
To: "OxY" <[EMAIL PROTECTED]>
Cc: "Chuck Swiger" <[EMAIL PROTECTED]>; <freebsd-performance@freebsd.org>
Sent: Sunday, March 19, 2006 11:46 AM
Subject: Re: packet drop with intel gigabit / marwell gigabit
OxY wrote:
CPU utilization is 0% if apache is not running and 10-20%, when running
and
serving 30-40 concurrent downloads (traffic is 3-4MB/s on fxp0 interface)
Is the number 3-4MB/s for per stream or the total for all 30-40 streams?
Are these downloads sent to a disk?
it's a total, 30-40 streams get the files from two sata disks in raid1
i measured the network performance with 'iperf' util, started the server
on my box
and benchmarked with a client on the other gigabit machine.
it showed 0% packet drop, when apache was not running and 4-7%, when
running..
then i checked how it behave when i shut down apache and init a local
file copy from one
(not system!) disk to other (not system disk either). packet drop was
5-10%, due to the higher load.
so i think interrupts or just the load takes the network performance, but
i have no clue how to fix it.
is it possible that the 2000+ xp amd is just weak to serve such a
traffic? (em0 traffic's maximum is 18-23MB/s)
i think it might be around 30MB/s without packet drop.
First let's clear the notation -- Is 30MB/s (MBytes/s) = 240Mb/s (Mbit/s)
or MB/s means Mbits/s
If MB/s is MBytes/s and you also write this amount data to a disk, plus
other traffic on fxp0 to disk too,
then your problem may be bonded by memory bandwidth because CPU
utilization is low:
(240 + 24~32) x 2 is about 535 Mbit/s (some chipset/motherboard has low
memory BW for AMD)
If this is true, then this no thing you can tune. What does the chipset
(Motherboard) this machine have?
30MB/s is Megabytes/sec, currently i have 18-20MB/s peak and 15MB/s avg.
it's not 535Mbit/s, because i only download it to my machine, no upload.
disks are different from apache disks, these disks have own controller in
one pci slot.
the packet drop is 5-7% at 200Mbit iperf test, 100Mbit drop is around zero.
i have <ASUS A7V8X> on motherboard which has VIA KT400 northbridge
http://uk.asus.com/products4.aspx?modelmenu=2&model=226&l1=3&l2=13&l3=62
i have an ABIT BE7
(http://www.abit.com.tw/page/uk/motherboard/motherboard_detail.php?pMODEL_NAME=BE7&fMTYPE=Socket%20478&pPRODINFO=Specifications)
resting somewhere, could it improve the network performance
with a P4-2.4GHZ(533FSB)?
(i don't want Intel-AMD flame :) )
dmesg if available here: http://field.hu/dmesg.txt
system disks are ad4 and ad6 in raid 1, these have the files for apache
users
(first i thought system disks & apache are the problem, tested on other
disk, have
the same result)
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