Yes it is absolutely possible to overrun the buffers. Any kind of backpressure (FC) from hosts, or 10G->1G transitions can easily cause it. Even if in a 10s window you're not over 1G if the 10G sender attempts to back to back too many frames in a row (Like say sendfile() API type calls) BOOM, dropping frames in the switch.
On Tue, Nov 29, 2016 at 1:28 PM, TJ Trout <[email protected]> wrote: > Luke; > > All l2, no l3. only 4 vlans. 2 peers trunked to a router which trunks back > to 2 devices (microwave backhauls). > > Chuck; > > All ports are 10g except the 2 peers are 1g and trunk back to a 10g port > for the router wan > > No TCN's > > Brian; > > I have tried a IBM G8124 and a Ubiquiti ES-16-XG both show same exact drops > across all ports, makes me think it's a config issue. MTU, FC, something. > > Andrew; > > I have tried with FC disabled, but I will try that one more time. > > Mikael; > > Is it possible to over run the buffers of a 320gbps backplane switch with > only 1.5gbps traffic? I think the switch is rated for 140m PPS and I'm only > pushing 100k PPS
