Denys Fedoryshchenko wrote:
Sorry. that i interfere in this subject.
Do you recommend CONFIG_IRQBALANCE to be enabled?
I certainly do not. Manual tweaking and pinning the irq's to the correct CPU
will
give the best performance (for specific loads).
The userspace irqbalance daemon tries very
David Miller [EMAIL PROTECTED] writes:
No IRQ balancing should be done at all for networking device
interrupts, with zero exceptions. It destroys performance.
Does irqbalanced need to be taught about this? And how about the
initial balancing, so that each network card gets assigned to one
Breno Leitao a écrit :
On Thu, 2008-01-10 at 12:52 -0800, Brandeburg, Jesse wrote:
Breno Leitao wrote:
When I run netperf in just one interface, I get 940.95 * 10^6 bits/sec
of transfer rate. If I run 4 netperf against 4 different interfaces, I
get around 720 * 10^6 bits/sec.
I
Maybe good idea to use sysstat ?
http://perso.wanadoo.fr/sebastien.godard/
For example:
visp-1 ~ # mpstat -P ALL 1
Linux 2.6.24-rc7-devel (visp-1) 01/11/08
19:27:57 CPU %user %nice%sys %iowait%irq %soft %steal
%idleintr/s
19:27:58 all0.000.00
On Fri, 2008-01-11 at 17:48 +0100, Eric Dumazet wrote:
Breno Leitao a écrit :
Take a look at the interrupt table this time:
io-dolphins:~/leitao # cat /proc/interrupts | grep eth[1]*[67]
277: 151362450 13 14 13 14
15 18
Hello Denys,
I've installed sysstat (good tools!) and the result is very similar
to the one which appears at top, take a look:
13:34:23 CPU %user %nice%sys %iowait%irq %soft %steal
%idleintr/s
13:34:24 all0.000.002.720.000.25 12.130.99
On Thu, 2008-01-10 at 12:52 -0800, Brandeburg, Jesse wrote:
Breno Leitao wrote:
When I run netperf in just one interface, I get 940.95 * 10^6 bits/sec
of transfer rate. If I run 4 netperf against 4 different interfaces, I
get around 720 * 10^6 bits/sec.
I hope this explanation makes
Breno Leitao wrote:
On Fri, 2008-01-11 at 17:48 +0100, Eric Dumazet wrote:
Breno Leitao a écrit :
Take a look at the interrupt table this time:
io-dolphins:~/leitao # cat /proc/interrupts | grep eth[1]*[67]
277: 151362450 13 14 13 14
15
From: Benny Amorsen [EMAIL PROTECTED]
Date: Fri, 11 Jan 2008 12:09:32 +0100
David Miller [EMAIL PROTECTED] writes:
No IRQ balancing should be done at all for networking device
interrupts, with zero exceptions. It destroys performance.
Does irqbalanced need to be taught about this?
The
Sorry. that i interfere in this subject.
Do you recommend CONFIG_IRQBALANCE to be enabled?
If it is enabled - irq's not jumping nonstop over processors. softirqd
changing this behavior.
If it is disabled, irq's distributed over each processor, and in loaded
systems it seems harmful.
I work a
Breno Leitao wrote:
Hello,
I've perceived that there is a performance issue when running netperf
against 4 e1000 links connected end-to-end to another machine with 4
e1000 interfaces.
I have 2 4-port interfaces on my machine, but the test is just
considering 2 port for each interfaces
Ben,
I am facing the performance issue when we try to bond the multiple
interfaces with virtual interface. It could be related to this thread.
My questions are,
*) When we use mulitple NICs, will the performance of overall system be
summation of all individual lines XX bits/sec. ?
*) What are
On Thu, 2008-01-10 at 16:36 +, Ben Hutchings wrote:
When I run netperf in just one interface, I get 940.95 * 10^6 bits/sec
of transfer rate. If I run 4 netperf against 4 different interfaces, I
get around 720 * 10^6 bits/sec.
snip
I take it that's the average for individual
Many many things to check when running netperf :)
*) Are the cards on the same or separate PCImumble bus, and what sort of bus
*) is the two interface performance two interfaces on the same four-port
card, or an interface from each of the two four-port cards?
*) is there a dreaded (IMO)
Breno Leitao wrote:
On Thu, 2008-01-10 at 16:36 +, Ben Hutchings wrote:
When I run netperf in just one interface, I get 940.95 * 10^6 bits/sec
of transfer rate. If I run 4 netperf against 4 different interfaces, I
get around 720 * 10^6 bits/sec.
snip
I take it that's the average for
I also tried to increase my interface MTU to 9000, but I am afraid that
netperf only transmits packets with less than 1500. Still investigating.
It may seem like picking a tiny nit, but netperf never transmits
packets. It only provides buffers of specified size to the stack. It is
then the
Breno Leitao wrote:
When I run netperf in just one interface, I get 940.95 * 10^6 bits/sec
of transfer rate. If I run 4 netperf against 4 different interfaces, I
get around 720 * 10^6 bits/sec.
This is actually a known issue that we have worked with your company
before on. It comes down to
From: Brandeburg, Jesse [EMAIL PROTECTED]
Date: Thu, 10 Jan 2008 12:52:15 -0800
I hope this explanation makes sense, but what it comes down to is that
combining hardware round robin balancing with NAPI is a BAD IDEA.
Absolutely agreed on all counts.
No IRQ balancing should be done at all for
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