[LARTC] Linux vs. Windows XP routing latency

[LARTC] Linux vs. Windows XP routing latency

[donsapo]

Hello, I have a problem with the latency of the packets passing a Linux router, and I thought perhaps you could put some light on it.
It's quite simple. I have one ADSL connection, and a LAN. The gateway is the Linux machine or a Windows XP machine. When the wXP is routing, for a host inside the LAN, the latency of, for example, the Counter Strike game to a given server is around 20 to 30 ms. When the Linux box is routing, the latency of the same game to same server increases to 60 to 80 ms. Even pinging that server's IP you can see the same difference.
This is a hard blow for me, I'm a Linux fan, and I thought Linux was going to perform better than Windows.
For testing I have disabled firewall, bandwidth limiting, everything except NAT, which is done by masquerading. Also tried SNAT, same result.
I'm using the 2.4.22 kernel.

Thanks in advance.

Ernesto.
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Re: [LARTC] Linux vs. Windows XP routing latency

[Peter Surda]

On Wed, Jun 02, 2004 at 03:01:37PM -0000, donsapo@artquitect.com.ar wrote:
> Hello,
hi

> When the wXP is routing, for a host inside the LAN, the latency of, for
> example, the Counter Strike game to a given server is around 20 to 30 ms.
> When the Linux box is routing, the latency of the same game to same server
> increases to 60 to 80 ms. Even pinging that server's IP you can see the same
> difference.
This sounds more like a duplex mismatch or IRQ problems. What's the card?

> Ernesto.
Bye,

Peter Surda (Shurdeek) <shurdeek@routehat.org>, ICQ 10236103, +436505122023

-- 
                    chown -R us ~your/*base*
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Re: [LARTC] Linux vs. Windows XP routing latency

[donsapo]

>> When the wXP is routing, for a host inside the LAN, the latency of, for
>> example, the Counter Strike game to a given server is around 20 to 30 ms.
>> When the Linux box is routing, the latency of the same game to same server
>> increases to 60 to 80 ms. Even pinging that server's IP you can see the same
>> difference.

>This sounds more like a duplex mismatch or IRQ problems. What's the card?

From dmesg:

via-rhine.c:v1.10-LK1.1.17  March-1-2003  Written by Donald Becker
  http://www.scyld.com/network/via-rhine.html
eth0: VIA VT6102 Rhine-II at 0xdc00, 00:0a:e6:a1:d9:01, IRQ 5.
eth0: MII PHY found at address 1, status 0x786d advertising 05e1 Link 45e1.
eth0: Setting full-duplex based on MII #1 link partner capability of 45e1.

What is a duplex mismatch?

Thanks.
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Re: [LARTC] Linux vs. Windows XP routing latency

[Debreczeni Peter]

> From dmesg:
> 
> via-rhine.c:v1.10-LK1.1.17  March-1-2003  Written by Donald Becker
>   http://www.scyld.com/network/via-rhine.html
> eth0: VIA VT6102 Rhine-II at 0xdc00, 00:0a:e6:a1:d9:01, IRQ 5.
> eth0: MII PHY found at address 1, status 0x786d advertising 05e1 Link 45e1.
> eth0: Setting full-duplex based on MII #1 link partner capability of 45e1.
> 
> What is a duplex mismatch?
> 

when two side of a link use different duplex setting
did you tried with another NIC card , via isn`t a fine
chip i think
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Re: [LARTC] Linux vs. Windows XP routing latency

[Ed Wildgoose]

>What is a duplex mismatch?
>  
>

When the duplex setting of your connection aren't matched....!  :-)

Google is very useful for finding out about stuff.  Try links 2,3 and 
onwards
http://www.google.com/search?sourceid=navclient&ie=UTF-8&oe=UTF-8&q=duplex+mismatch

However, if you have even a budget "switch" in between these two 
machines then this would fix the problem.  Note that a "hub" will not 
fix the problem though.

Ed W
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Re: [LARTC] Linux vs. Windows XP routing latency

[Ronny Aasen]

On Sat, 2004-06-05 at 15:06, Ed Wildgoose wrote:
> >What is a duplex mismatch?
> >  
> >
> 
> When the duplex setting of your connection aren't matched....!  :-)
> 
> Google is very useful for finding out about stuff.  Try links 2,3 and 
> onwards
> http://www.google.com/search?sourceid=navclient&ie=UTF-8&oe=UTF-8&q=duplex+mismatch
> 
> However, if you have even a budget "switch" in between these two 
> machines then this would fix the problem.  Note that a "hub" will not 
> fix the problem though.


well technicaly then you can have duplex mismatch between the nic and
the switchport.. i have seen this several times using different
equipment.

one other things that i have noticed can impact your network is nic's
that use software crc vs real Network cards (rtl8139 jumps to mind, dont
know about the rhino ones), software crc makes the bus/cpu work a lot
harder then a nick with incorperated crc, you will notice the difference
on your cpu usage.

would be nice to hear if you found your problem.

mvh
-- 
Ronny Aasen <list@datapart-as.no>

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Re: [LARTC] Linux vs. Windows XP routing latency

[Paulo Andre]

On Friday 04 June 2004 10:13, donsapo@artquitect.com.ar wrote:
>
> From dmesg:
>
> via-rhine.c:v1.10-LK1.1.17  March-1-2003  Written by Donald Becker
>   http://www.scyld.com/network/via-rhine.html
> eth0: VIA VT6102 Rhine-II at 0xdc00, 00:0a:e6:a1:d9:01, IRQ 5.
> eth0: MII PHY found at address 1, status 0x786d advertising 05e1 Link 45e1.
> eth0: Setting full-duplex based on MII #1 link partner capability of 45e1.
>
> What is a duplex mismatch?
run mii-tool and see how your card is set up.

Paulo

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Re: [LARTC] Linux vs. Windows XP routing latency

[Andy Furniss]

donsapo@artquitect.com.ar wrote:
> Hello, I have a problem with the latency of the packets passing a Linux router, and I thought perhaps you could put some light on it.
> It's quite simple. I have one ADSL connection, and a LAN. The gateway is the Linux machine or a Windows XP machine. When the wXP is routing, for a host inside the LAN, the latency of, for example, the Counter Strike game to a given server is around 20 to 30 ms. When the Linux box is routing, the latency of the same game to same server increases to 60 to 80 ms. Even pinging that server's IP you can see the same difference.
> This is a hard blow for me, I'm a Linux fan, and I thought Linux was going to perform better than Windows.
> For testing I have disabled firewall, bandwidth limiting, everything except NAT, which is done by masquerading. Also tried SNAT, same result.
> I'm using the 2.4.22 kernel.

Is the dsl modem ethernet  - if it is I would consider asking the 
maintainer of the driver for your card. Details in the kernel 
docs/source. I get 20 - 30 ms in Half Life OK using a P200 linux gateway 
  doing NAT etc.

You could also try a newer Kernel.

Andy.


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