[c-nsp] mitigate output drops on Cisco 2960G platform

[Blake Dunlap]

Making the linux box slower in the ways described (other than packet
pacing) would just increase the cpu load. If those are feeder servers,
you're much better off dropping the link speed to 100m or configuring TC
outbound than turning off a lot of the cpu offloading.

Or alternately, not trying to connect 10 servers at 1g to a budget access
layer switch with a single 1g uplink. If you don't want oversubscription,
don't oversubscribe....

-Blake


On Fri, Sep 20, 2013 at 4:29 PM, Joerg Mayer <jmayer at loplof.de> wrote:

> On Fri, Sep 20, 2013 at 07:23:17PM +0100, Phil Mayers wrote:
> > (However: I wonder if the various techniques being discussed
> > elsewhere - like the new Linux kernel packet pacing, disabling TCP
> > segmentation offload and reducing nic ring, kernel and app buffers -
> > might alleviate the generation of microbursts?)
>
> As long as your problems are TCP related yes, things should be getting
> less bad. If you have UDP traffic (think videostreaming, I-frames), you
> don't get that help.
>
> Ciao
>    J\303\266rg
>
> --
> Joerg Mayer                                           <jmayer at loplof.de>
> We are stuck with technology when what we really want is just stuff that
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