Re: [j-nsp] ex4500 best-effort drops nowhere near congested

2013-05-08 Thread ryanL
thx jeff. yeah, all these ports are actually already in ae bundles. and i've disabled flow-control on all of 'em. seems like the best i can do, i guess. On Wed, May 8, 2013 at 7:44 AM, Jeff Wheeler wrote: > On Tue, May 7, 2013 at 4:01 PM, ryanL wrote: >> good discussion. the tl;dr - nothing i ca

Re: [j-nsp] ex4500 best-effort drops nowhere near congested

2013-05-08 Thread Jeff Wheeler
On Tue, May 7, 2013 at 4:01 PM, ryanL wrote: > good discussion. the tl;dr - nothing i can do about it. right? You can add LACP/ECMP ports/paths to reduce the chance that packets need to be buffered so long that the buffer becomes full. To use a dirty word, flow-control might be an option as well

Re: [j-nsp] ex4500 best-effort drops nowhere near congested

2013-05-07 Thread ryanL
good discussion. the tl;dr - nothing i can do about it. right? On Thu, May 2, 2013 at 2:51 PM, Michael Loftis wrote: > I was finally able to get this explained via a third party who designs > these things ... > > Basically in S&F you have an input and output queue, per port. When > port 1 sends

Re: [j-nsp] ex4500 best-effort drops nowhere near congested

2013-05-02 Thread Michael Loftis
I was finally able to get this explained via a third party who designs these things ... Basically in S&F you have an input and output queue, per port. When port 1 sends to port 2 frames are moved from 1's input queue to 2's output queue. If 2's out queue fills, it blocks back into 1's input queue

Re: [j-nsp] ex4500 best-effort drops nowhere near congested

2013-05-02 Thread joel jaeggli
On 5/2/13 1:24 PM, Benny Amorsen wrote: joel jaeggli writes: There's literally no options in between. so a 1/10Gb/s TOR like the force10 s60 might have 2GB of shared packet buffer, while an like an arista 7050s-64 would have 9MB for all the ports, assuming you run it as all 10Gb/s rather than

Re: [j-nsp] ex4500 best-effort drops nowhere near congested

2013-05-02 Thread Michael Loftis
On Thursday, May 2, 2013, Benny Amorsen wrote: > joel jaeggli > writes: > > > There's literally no options in between. so a 1/10Gb/s TOR like the > > force10 s60 might have 2GB of shared packet buffer, while an like an > > arista 7050s-64 would have 9MB for all the ports, assuming you run it > > a

Re: [j-nsp] ex4500 best-effort drops nowhere near congested

2013-05-02 Thread Benny Amorsen
joel jaeggli writes: > There's literally no options in between. so a 1/10Gb/s TOR like the > force10 s60 might have 2GB of shared packet buffer, while an like an > arista 7050s-64 would have 9MB for all the ports, assuming you run it > as all 10Gb/s rather than 100/1000/1/4 mixes of ports

Re: [j-nsp] ex4500 best-effort drops nowhere near congested

2013-05-02 Thread joel jaeggli
On 5/2/13 10:27 AM, Jeff Wheeler wrote: On Wed, May 1, 2013 at 8:27 PM, ryanL wrote: i'm guessing this is a buffer thing, but i can't explain why it only happens on my 1ge ports and not when i punt the traffic over an 10ge Yes, it is a buffer thing. A 10GE interface is basically never going t

Re: [j-nsp] ex4500 best-effort drops nowhere near congested

2013-05-02 Thread Jeff Wheeler
On Wed, May 1, 2013 at 8:27 PM, ryanL wrote: > i'm guessing this is a buffer thing, but i can't explain why it only > happens on my 1ge ports and not when i punt the traffic over an 10ge Yes, it is a buffer thing. A 10GE interface is basically never going to not have time to transmit frames unle

[j-nsp] ex4500 best-effort drops nowhere near congested

2013-05-02 Thread ryanL
hi list. i'm guessing this is a buffer thing, but i can't explain why it only happens on my 1ge ports and not when i punt the traffic over an 10ge port. i have two 1ge in an ae bundle. both of them basically look like this: Statistics last cleared: 2013-05-02 00:16:50 UTC (00:02:02 ago) Traf