[Routing] Performance Comparison between 2.6 and 2.4 kernel

[Routing] Performance Comparison between 2.6 and 2.4 kernel

[Song Wang]

Hi,

I'm looking for the network packet routing
performance comparison between the latest 2.4
and 2.6 kernel.

I did some initial testing on my mips-based router.
2.6 kernel (2.6.8.1) performed way below 2.4 kernel
(2.4.17). It sucks. Turning on preemption on 2.6 
kernel even makes routing performance worse.

Anybody did a comprehensive study on the routing
performance for 2.6 and 2.4 kernel?

Thanks.


		
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Re: [Routing] Performance Comparison between 2.6 and 2.4 kernel

[jamal]

What mips board is this? NAPI based?
I would say that you should get higher numbers with 2.6.x.
Are you running any sort of apps that need gettimeofday?
I have certainly seen higher numbers on 2.6 vs 2.4 starting at some
point where Andis gettimeofday patch went in - but this was on x86.

cheers,
jamal

On Fri, 2004-09-10 at 20:52, Song Wang wrote:
> Hi,
> 
> I'm looking for the network packet routing
> performance comparison between the latest 2.4
> and 2.6 kernel.
> 
> I did some initial testing on my mips-based router.
> 2.6 kernel (2.6.8.1) performed way below 2.4 kernel
> (2.4.17). It sucks. Turning on preemption on 2.6 
> kernel even makes routing performance worse.
> 
> Anybody did a comprehensive study on the routing
> performance for 2.6 and 2.4 kernel?
> 
> Thanks.
> 
> 
> 		
> __________________________________
> Do you Yahoo!?
> Y! Messenger - Communicate in real time. Download now. 
> http://messenger.yahoo.com
> 
> 

Re: [Routing] Performance Comparison between 2.6 and 2.4 kernel

[Song Wang]

Hi,

The mips CPU on the board is MIPS32 compatible.
I don't think it's NAPI based.

The gettimeofday patch you mentioned came into
the 2.6 kernel at what version?

Do you think it's related to HZ change from 100
to 1000? Actually I did change HZ back to 100,
but it didn't help.

-Song


--- jamal <hadi@cyberus.ca> wrote:

> 
> What mips board is this? NAPI based?
> I would say that you should get higher numbers with
> 2.6.x.
> Are you running any sort of apps that need
> gettimeofday?
> I have certainly seen higher numbers on 2.6 vs 2.4
> starting at some
> point where Andis gettimeofday patch went in - but
> this was on x86.
> 
> cheers,
> jamal
> 
> On Fri, 2004-09-10 at 20:52, Song Wang wrote:
> > Hi,
> > 
> > I'm looking for the network packet routing
> > performance comparison between the latest 2.4
> > and 2.6 kernel.
> > 
> > I did some initial testing on my mips-based
> router.
> > 2.6 kernel (2.6.8.1) performed way below 2.4
> kernel
> > (2.4.17). It sucks. Turning on preemption on 2.6 
> > kernel even makes routing performance worse.
> > 
> > Anybody did a comprehensive study on the routing
> > performance for 2.6 and 2.4 kernel?
> > 
> > Thanks.
> > 
> > 
> > 		
> > __________________________________
> > Do you Yahoo!?
> > Y! Messenger - Communicate in real time. Download
> now. 
> > http://messenger.yahoo.com
> > 
> > 
> 
> 



		
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Re: [Routing] Performance Comparison between 2.6 and 2.4 kernel

[David S. Miller]

On Wed, 15 Sep 2004 11:06:03 -0700 (PDT)
Song Wang <wsonguci@yahoo.com> wrote:

> The mips CPU on the board is MIPS32 compatible.
> I don't think it's NAPI based.

NAPI is an attribute of the network adapter, not
the cpu.

Although I would very much anticipate this being
a MIPS or network adapter specific problem since
on x86 routing is pretty fast in 2.6.x

Re: [Routing] Performance Comparison between 2.6 and 2.4 kernel

[jamal]

On Wed, 2004-09-15 at 14:08, David S. Miller wrote:
> On Wed, 15 Sep 2004 11:06:03 -0700 (PDT)
> Song Wang <wsonguci@yahoo.com> wrote:
> 
> > The mips CPU on the board is MIPS32 compatible.
> > I don't think it's NAPI based.
> 
> NAPI is an attribute of the network adapter, not
> the cpu.
> 
> Although I would very much anticipate this being
> a MIPS or network adapter specific problem since
> on x86 routing is pretty fast in 2.6.x

Note, I could hit 4-500Kpps on a bcom sb1250 800Mhz; trying to simulate
Andis gettimeofday changes (which are in 2.6 since i havent seen a 2.6
port for that board ) gives another 100Kpps. Theres still room for
improvement just havent had time.
You are right though it could be a 2.6.x arch specific issue. Bacchus?

cheers,
jamal

Re: [Routing] Performance Comparison between 2.6 and 2.4 kernel

[Song Wang]

> > 
> > Although I would very much anticipate this being
> > a MIPS or network adapter specific problem since
> > on x86 routing is pretty fast in 2.6.x
> 
> Note, I could hit 4-500Kpps on a bcom sb1250 800Mhz;
> trying to simulate
> Andis gettimeofday changes (which are in 2.6 since i
> havent seen a 2.6
> port for that board ) gives another 100Kpps. Theres
> still room for
> improvement just havent had time.
> You are right though it could be a 2.6.x arch
> specific issue. Bacchus?
> 
> cheers,
> jamal
> 
> 
Hi Jamal and Dave,

I continued to do some testing in a minimal
environment, basically the routing between the
two ethernet ports on the mips board. Only
ethernet driver is loaded. The user-space
only has busybox.

The difference between 2.6.8.1 and 2.4.17 kernel
is 3000pps less for routing. However, the bridging
performance is the same between two kernels.

Jamal, where is the Andis gettimeofday changes
you mentioned?

Thanks.

-Song





		
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Re: [Routing] Performance Comparison between 2.6 and 2.4 kernel

[Song Wang]

Hi, jamal,

Could you please kindly point where the gettimeofday
patch is? Is it in 2.6.8.1 kernel?

BTW, what is the packet size for you performance
number, 64 bytes?

I appreciate it.

-Song
--- jamal <hadi@cyberus.ca> wrote:

> On Wed, 2004-09-15 at 14:08, David S. Miller wrote:
> > On Wed, 15 Sep 2004 11:06:03 -0700 (PDT)
> > Song Wang <wsonguci@yahoo.com> wrote:
> > 
> > > The mips CPU on the board is MIPS32 compatible.
> > > I don't think it's NAPI based.
> > 
> > NAPI is an attribute of the network adapter, not
> > the cpu.
> > 
> > Although I would very much anticipate this being
> > a MIPS or network adapter specific problem since
> > on x86 routing is pretty fast in 2.6.x
> 
> Note, I could hit 4-500Kpps on a bcom sb1250 800Mhz;
> trying to simulate
> Andis gettimeofday changes (which are in 2.6 since i
> havent seen a 2.6
> port for that board ) gives another 100Kpps. Theres
> still room for
> improvement just havent had time.
> You are right though it could be a 2.6.x arch
> specific issue. Bacchus?
> 
> cheers,
> jamal
> 
> 



		
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