Re: [load balancing] Cascading switches off of a Foundry switch

From: Alex Samonte (asamonteIZZATsitesmith.com)
Date: Thu Feb 22 2001 - 21:42:19 EST

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    On Thu, Feb 22, 2001 at 01:36:11PM -0500, Nimesh Vakharia wrote:
    >
    > On Tue, 20 Feb 2001, Alex Samonte wrote:
    >
    > Agreed that LB is not looking at the payload BUT it caputures it,
    > it copies it into memory, rewrites the packet header. Copies it out to the
    > outbound buffer and then sends the packet back to the client. DSR u'r not
    > doing this for outbound packets. Typically in any HTTP serving environment
    > your inbound traffic is usually 1/10th or 1/15th of your outbound
    > traffic. ie your pushing 3M inbound, server responses will be around
    > 30-40M outbound. You are eliminating 30-40M of traffic going through your
    > LB.

    My point is the size of the packet is not a big impact on the LB. The number
    of pps is.

    > > > Overall I've nothing against any setup, but DSR seems to be a
    > > > good option and not something u should be afraid off. Think I convinced
    > > > you try using DSR in your next setup? :P
    > >
    > > DSR was a patch when there was a performance bottleneck in the LB. It allowed
    > > me to scale further when there were no other options. Now there are options.
    > Well, I'll be happy as long as you don't rule it out of your book
    > and be optimistic about it :).

    I don't rule it out, but I consider DSR a corner case.

    -Alex



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