[c-nsp] effect of 'mls qos'

Marian Ďurkovič md at bts.sk
Mon Jun 1 02:12:53 EDT 2015

By enabling 'mls qos' you're splitting your already small buffer space on this
platform into 4 pieces and using just one of them for normal traffic...


On Sun, 31 May 2015 23:02:45 -0700, Mike wrote
> Hi Gang,
>      I have a question regarding the effect of 'mls qos' on a 3560g 
> switch, with no other configuration.
>      I did some testing and it seemed to me that the aggregate thruput 
> of my switch, which has 5 port channels with 2 gigE ports each, would 
> drastically drop to below 10mbps for a standard file copy on nfs. And 
> when I removed 'mls qos', the thruput would climb back up to 500 - 
> 700mbps range on that same file copy.
>      There is no qos fig in that switch, just that single statement. 
> It also does have 'ip services' code in it but it's only used really 
> for layer 2 switching. I just thought this was rather odd, wondering 
> if anyone has any thoughts on this.
> Mike--
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