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Certain NICs handle more of the IP processing themselves, but require kernel
support for this.
(I've seen NICs that will handle most of iSCSI themselves)
I suggest loking up the Linux Kernel or Networking mailing lists.
I don't know if the system balances IRQ handling over multiple cores.
If so, upgrading to quadcore should linearly scale your performance.
Regards,
Kit
-----Original Message-----
From: lvs-users-bounces@xxxxxxxxxxxxxxxxxxxxxx
[mailto:lvs-users-bounces@xxxxxxxxxxxxxxxxxxxxxx] On Behalf Of
jason.faulkner@xxxxxxxxxxxxx
Sent: dinsdag 3 maart 2009 8:08
To: LinuxVirtualServer.org users mailing list.
Subject: Re: [lvs-users] LVS performance on SMP
-----Original Message-----
From: "New User" <jfjm2002@xxxxxxxxx>
Sent: Tuesday, March 3, 2009 12:45am
To: lvs-users@xxxxxxxxxxxxxxxxxxxxxx
Subject: [lvs-users] LVS performance on SMP
Can anyone share their knowledge or experience for the following:
1. Can LVS increase linearly in capacity when we go from the setup we
currently have (2 cores with 2 NICs) to what we are considering (8 cores,
with 8 NICs)
2. Has anyone else used similiar setup that can share their experience?
There was a posting to the mailing list in Dec. 2007 that indicated the
performance limit is ~450K (don't know if it's the sum of InPPS and
OutPPS) pps. There was no conclusive answer as to this was the limit of LVS
or not
3. Has anyone have a setup that can process 1+ million pps (LVS-NAT) on a
single LVS machine (we already use multipel LVS with keepalived in a
live-live configuration)?
==============================
I'd be willing to bet that your problem lies in "soft IRQ %"... basically,
you're CPU is getting eaten up by NIC interrupts moreso than anything
LVS/iptables related.
I've yet to find a good solution to this; if there is one I'm very keen to
hear it.
--
Jason Faulkner
Linux Systems Engineer
Mailtrust, a division of Rackspace
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