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List: loadbalancing-l
Subject: RE: [load balancing] Alteon AD3 Performance
From: "Philip Goldie" <pgoldie () nortelnetworks ! com>
Date: 2003-02-27 2:48:12
[Download RAW message or body]
Wei Keong,
Do you have a packet capture of this behaviour ?
Phil
-----Original Message-----
From: Wei Keong [mailto:chooweikeong@pacific.net.sg]
Sent: 26 February 2003 12:39
To: 'lb-l@vegan.net'
Subject: RE: [load balancing] Alteon AD3 Performance
Hi Phil,
I'm using the AD2 to load balance the DNS servers, using VIP. To
measure the performance, I've script (dig) to poll the AD2 vip and the
real servers, every 5 min.
What puzzled me is the fact that the performance via AD2 is worse than
direct to the real servers. Upon investigation, there seems to be some
delay in the response when a first dig command is issued to AD2.
Subsequent dig commands show much better results.
Is this a common problem, that the first connection to AD2 will take
longer? Any way to overcome this?
Thanks,
Wei Keong
On Wed, 26 Feb 2003, Philip Goldie wrote:
> Hi Dusan,
>
> When you ping the Virtual IP Address, the ICMP request and
> reply are handled by the MIP in the switch so the traffic
> does not go to the real servers. This explains why you see
> a difference in response times. I would check the port speed
> and duplex settings on all switch ports and server NICs and
> re-test.
>
> Rest assured, Alteon switches are used in some of the highest
> performance environments in the Internet....
>
> cheers
>
> //Phil
>
> -----Original Message-----
> From: Dusan Senkypl [mailto:senkypl@trafficsyndicate.com]
> Sent: 22 February 2003 09:16
> To: lb-l@vegan.net
> Subject: [load balancing] Alteon AD3 Performance
>
>
> Hi,
>
> I have a failover AD3 setup for our servers. We have 2 groups of 3&2
> load balanced servers and 2 individual real servers. No filtering is
> performed.
>
> All servers provide download services (small files), web services and
> asp pages. During the test setup I was sending only some 100
> users/second on 1 virtual server and I've got quite bad response times..
> I was monitoring ping at the same time and while it was only some
> 40-50ms on the virtual server IP, it was 100+ms on real servers in that
> group..
>
> Can you give me some realistic estimation of potential performance? I'm
> afraid to send there our current 500+ users per second - is
> theperformance of Alteon so bad?
>
> Thanks fo your opinion..
>
> Regards,
> Dusan Senkypl
>
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> Unsubscribe: mailto:majordomo@vegan.net?body=unsubscribe%20lb-l
> Archive: http://vegan.net/lb/archive
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>
>
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<P><FONT SIZE=2>Wei Keong, </FONT>
</P>
<P><FONT SIZE=2>Do you have a packet capture of this behaviour ?</FONT>
</P>
<P><FONT SIZE=2>Phil</FONT>
</P>
<P><FONT SIZE=2>-----Original Message-----</FONT>
<BR><FONT SIZE=2>From: Wei Keong [<A \
HREF="mailto:chooweikeong@pacific.net.sg">mailto:chooweikeong@pacific.net.sg</A>]</FONT>
<BR><FONT SIZE=2>Sent: 26 February 2003 12:39</FONT>
<BR><FONT SIZE=2>To: 'lb-l@vegan.net'</FONT>
<BR><FONT SIZE=2>Subject: RE: [load balancing] Alteon AD3 Performance</FONT>
</P>
<BR>
<P><FONT SIZE=2>Hi Phil,</FONT>
</P>
<P><FONT SIZE=2>I'm using the AD2 to load balance the DNS servers, using VIP. \
To</FONT> <BR><FONT SIZE=2>measure the performance, I've script (dig) to poll the AD2 \
vip and the</FONT> <BR><FONT SIZE=2>real servers, every 5 min.</FONT>
</P>
<P><FONT SIZE=2>What puzzled me is the fact that the performance via AD2 is worse \
than</FONT> <BR><FONT SIZE=2>direct to the real servers. Upon investigation, there \
seems to be some</FONT> <BR><FONT SIZE=2>delay in the response when a first dig \
command is issued to AD2.</FONT> <BR><FONT SIZE=2>Subsequent dig commands show much \
better results.</FONT> </P>
<P><FONT SIZE=2>Is this a common problem, that the first connection to AD2 will \
take</FONT> <BR><FONT SIZE=2>longer? Any way to overcome this?</FONT>
</P>
<P><FONT SIZE=2>Thanks,</FONT>
<BR><FONT SIZE=2>Wei Keong</FONT>
</P>
<BR>
<P><FONT SIZE=2>On Wed, 26 Feb 2003, Philip Goldie wrote:</FONT>
</P>
<P><FONT SIZE=2>> Hi Dusan,</FONT>
<BR><FONT SIZE=2>></FONT>
<BR><FONT SIZE=2>> When you ping the Virtual IP Address, the ICMP request \
and</FONT> <BR><FONT SIZE=2>> reply are handled by the MIP in the switch so the \
traffic</FONT> <BR><FONT SIZE=2>> does not go to the real servers. This explains \
why you see</FONT> <BR><FONT SIZE=2>> a difference in response times. I would \
check the port speed</FONT> <BR><FONT SIZE=2>> and duplex settings on all switch \
ports and server NICs and</FONT> <BR><FONT SIZE=2>> re-test.</FONT>
<BR><FONT SIZE=2>></FONT>
<BR><FONT SIZE=2>> Rest assured, Alteon switches are used in some of the \
highest</FONT> <BR><FONT SIZE=2>> performance environments in the \
Internet....</FONT> <BR><FONT SIZE=2>></FONT>
<BR><FONT SIZE=2>> cheers</FONT>
<BR><FONT SIZE=2>></FONT>
<BR><FONT SIZE=2>> //Phil</FONT>
<BR><FONT SIZE=2>></FONT>
<BR><FONT SIZE=2>> -----Original Message-----</FONT>
<BR><FONT SIZE=2>> From: Dusan Senkypl [<A \
HREF="mailto:senkypl@trafficsyndicate.com">mailto:senkypl@trafficsyndicate.com</A>]</FONT>
<BR><FONT SIZE=2>> Sent: 22 February 2003 09:16</FONT>
<BR><FONT SIZE=2>> To: lb-l@vegan.net</FONT>
<BR><FONT SIZE=2>> Subject: [load balancing] Alteon AD3 Performance</FONT>
<BR><FONT SIZE=2>></FONT>
<BR><FONT SIZE=2>></FONT>
<BR><FONT SIZE=2>> Hi,</FONT>
<BR><FONT SIZE=2>></FONT>
<BR><FONT SIZE=2>> I have a failover AD3 setup for our servers. We have 2 groups \
of 3&2</FONT> <BR><FONT SIZE=2>> load balanced servers and 2 individual real \
servers. No filtering is</FONT> <BR><FONT SIZE=2>> performed.</FONT>
<BR><FONT SIZE=2>></FONT>
<BR><FONT SIZE=2>> All servers provide download services (small files), web \
services and</FONT> <BR><FONT SIZE=2>> asp pages. During the test setup I was \
sending only some 100</FONT> <BR><FONT SIZE=2>> users/second on 1 virtual server \
and I've got quite bad response times..</FONT> <BR><FONT SIZE=2>> I was monitoring \
ping at the same time and while it was only some</FONT> <BR><FONT SIZE=2>> 40-50ms \
on the virtual server IP, it was 100+ms on real servers in that</FONT> <BR><FONT \
SIZE=2>> group..</FONT> <BR><FONT SIZE=2>></FONT>
<BR><FONT SIZE=2>> Can you give me some realistic estimation of potential \
performance? I'm</FONT> <BR><FONT SIZE=2>> afraid to send there our current 500+ \
users per second - is</FONT> <BR><FONT SIZE=2>> theperformance of Alteon so \
bad?</FONT> <BR><FONT SIZE=2>></FONT>
<BR><FONT SIZE=2>> Thanks fo your opinion..</FONT>
<BR><FONT SIZE=2>></FONT>
<BR><FONT SIZE=2>> Regards,</FONT>
<BR><FONT SIZE=2>> Dusan Senkypl</FONT>
<BR><FONT SIZE=2>></FONT>
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