You cannot do blind tuning according those numbers. They are for
1-10Gbps pipe.
The proper number is "pipe diamter" x "pipe length" = capacity
In your case, the maximum number = 100Mbps x "delay from your machine to
server"
-Jin
Daniel Andersson wrote:
Hey!
I was trying to milk the most o
Peter Jeremy wrote:
On Sun, 2006-Aug-27 16:37:29 -0700, Jin Guojun [VFFS] wrote:
I have difficulty to get CD/DVD write speed above 1.6MB/s (10x for CD,
or 1.1x for DVD).
The problem seems to be the interrupt rate is high (70-80% of CPU) for
CD/DVD drive(r).
Your drive is probably
I have difficulty to get CD/DVD write speed above 1.6MB/s (10x for CD,
or 1.1x for DVD).
The problem seems to be the interrupt rate is high (70-80% of CPU) for
CD/DVD drive(r).
I have tried three different CD/DVD drives under three different
hardware platform
with FreeBSD 4.11-R/6.1-R via gro
Raymond Owens wrote:
Sir,
By hardware cache size, you are referring to the processor cache? If the box
has two processors, should the value used for cache size in this calculation be
doubled? In very general terms, what is the link between the net.bpf.bufsize
and the cache? Thanks for info.
R. B. Riddick wrote:
--- Raymond Owens <[EMAIL PROTECTED]> wrote:
Questions:
Can VM_KMEM_SIZE_MAX be set manually with sysctl?
No, but you could set it with this procedure:
1. Insert the lines
vm.kmem_size=123456789
vm.kmem_size_max=1234567890
in
/boot/loader.conf
2. reboot
That
For this situation, you can run "netstat -m" to see if there is mbuf outage.
Attached is a shell script to watch mbuf usage in 1 second interval.
If you see the maximum-used (peak) count reach (or close) to the "max",
and the cur count changes dramatically during your test, you then may have
memo
OxY wrote:
what kind of details should i attach? to analyze the problem?
Assume that you have process A to cause process B dropping packets:
Step (1):
Run B only -- what is the maximum through without packet drop?
what is the CPU utilization?
what type of t
Lucas Holt wrote:
On Mar 24, 2006, at 8:12 AM, OxY wrote:
hi guys!
well, i changed my motherboard and CPU from the
asus a7v8x+amd 2000+ xp to
the abit be7 + p4 2.4 (533fsb) and the packet loss fell down from
8% to 2%, but
still have loss...
loss coming when i have load.. i guess it decr
Gary Thorpe wrote:
[No subject in first one, sorry for repost]
...
1.6 Gb/s = system bus bandwidth. Cache won't affect this bandwidth. DDR400 has
400 MB/s: only attainable for long sequential accesses of either read or write
but not a mix of both. DMA should be able to get near this limit (lon
Chris Howells wrote:
On Wednesday 22 March 2006 18:52, Arne Woerner wrote:
It is an ECS K7VMM or K7VMM+ if I recall it correctly... Bought in
2003...
Is it easy to explain, why the 266FSB cannot do 8Gbit/sec without
problem? I mean: 2*133MHz*32bit=8.3125Gbit/sec... Is the MMU too
slow (e.
Arne Woerner wrote:
Notice that your memory copy speed will be one half of it.
Why "half"? dd causes two copies but counts each byte just once...
Maybe "dd" in combination with /dev/zero is not the right way to
measure memory bandwidth?
It depends on how /dev/null implemented. It m
Arne Woerner wrote:
It depends on how you use /dev/zero.
dd of=/dev/null if=/dev/zero bs=4k count=100k
tests cache speed
% dd of=/dev/null if=/dev/zero bs=4k count=100k
102400+0 records in
102400+0 records out
419430400 bytes transferred in 0.204511 secs (2050894814
bytes/sec)
ab
Arne Woerner wrote:
--- "Jin Guojun [VFFS]" [1]<[EMAIL PROTECTED]> wrote:
In you example:
Now your 1.6 GB/s reduced to 16MB/s or even worse just based
on this factor.
What did we show by this <> test? I thought
that would prove the memory bandwidth is about 8Gbit/s
You are fast away from the real world. This has been explained million
times, just like
I teach intern student every summer :-)
First of all, DDR400 and 200 MHz bus mean nothing -- A DDR 266 + 500MHz
CPU system
can over perform a DDR 400 + 1.7 GHz CPU system. Another example:
I 2 CPU wa
OxY wrote:
- Original Message - From: "Jin Guojun [VFFS]" <[EMAIL PROTECTED]>
To: "OxY" <[EMAIL PROTECTED]>
Cc:
Sent: Monday, March 20, 2006 4:05 AM
Subject: Re: packet drop with intel gigabit / marwell gigabit
First let's clear the notat
OxY wrote:
- Original Message - From: "Jin Guojun (VFFS)" <[EMAIL PROTECTED]>
To: "OxY" <[EMAIL PROTECTED]>
Cc: "Chuck Swiger" <[EMAIL PROTECTED]>;
Sent: Sunday, March 19, 2006 11:46 AM
Subject: Re: packet drop with intel gigabit / mar
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?
i measured the networ
It is still not clear how you did measurement.
Did FTP show such % drop? or Did you measure it by other tools?
How did you measured incoming traffic?
http://field.hu/netstat.txt shows 0 tcp packet drop.
Anyway, the first thing first is to have CPU utilization when you see packet
drop.
This can
Peter Pentchev wrote:
On Fri, Dec 09, 2005 at 08:05:37PM -0800, Jin Guojun [VFFS] wrote:
David Xu wrote:
Gustavo A. Baratto wrote:
Since the last post just had freebsd numbers, I'm re-posting it
including
Linux as well. Both linux and freebsd numbers were taken fro
Mathieu Arnold wrote:
+-le 10/12/2005 14:58 -0800, Jin Guojun [VFFS] écrivait :
| What is "netstat -m" output on your machine?
130 mbufs in use
128/8640 mbuf clusters in use (current/max)
0/24/2416 sfbufs in use (current/peak/max)
288 KBytes allocated to network
0 requests for sfbuf
What is "netstat -m" output on your machine?
Mathieu Arnold wrote:
+-le 07/12/2005 12:44 +0200, Imri Zvik écrivait :
| Hi!
|
| I'm trying to setup a syslog server to serve a large group of servers.
| For the syslog daemon, I have chosen rsyslogd, and the backend is mysql (on
| a different mac
David Xu wrote:
Gustavo A. Baratto wrote:
Since the last post just had freebsd numbers, I'm re-posting it
including
Linux as well. Both linux and freebsd numbers were taken from the
same box:
...
Can you try TSC timer on FreeBSD ? someone reported that using TSC
timer boosts performance o
Clear enough.
em(4) should be able to handle this amount traffic without polling
unless all syslog
traffics come at the same time that could cause congested resource. That
is why I want you to run
the script to watch the CPU utilization when the drop happens. The
average CPU use does NOT
refle
jaws wrote:
What you need is more sockets available and a much larger sockbufs.
Try adjusting the following parameters:
net.inet.udp.maxdgram
net.inet.udp.recvspace
maxdgram has nothing to do with this on receiver side.
If you want to play with this parameter, try to REDUCE it on sender side.
Bruce Evans wrote:
On Tue, 19 Apr 2005, Bosko Milekic wrote:
My experience with 6.0-CURRENT has been that I am able to push at
least about 400kpps INTO THE KERNEL from a gigE em card on its own
64-bit PCI-X 133MHz bus (i.e., the bus is uncontested) and that's
A 64-bit bus doesn't seem to be ess
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