Microbursts causing buffer drops on egress ports to non-10G capable destinations. The switch wants to send data at a rate faster than the 1G devices can take it in, so it has to buffer it's data on those ports. Eventually those buffers fill up, and it taildrops traffic. TCP flow control takes over and eventually slows the transfer rate by reducing window size. It doesn't matter if its only sending 100M of data, its the RATE that it is sending the data.
On Nov 7, 2016 8:58 AM, "TJ Trout" <t...@voltbb.com> wrote: > I have a 10G switch that is switching everything of mine at my NOC, > including peers, router wan, router lan, uplink to tower, etc > > During peak traffic periods ~2gbps I'm seeing 1% packet loss and > throughput will drop to 0 for just a second and resume normal for a few > minutes before dropping back to zero for just a second. doesn't seem to be > affecting the wan side of my router which connects to peers through the > same switch. Doesn't happen during the day with low periods of traffic. > > I've enabled / disabled STP, Flow control. > > I believe I've isolated it to not be a single port, possibly have a bad > switch but that seems hard to believe... > > Port isn't flapping, getting small amounts of fcs errors on receive and > lots of length errors but i think those shouldn't be a problem? > > It's an IBM G8124 10G switch > > Ideas? > > _______________________________________________ > Wireless mailing list > Wireless@wispa.org > http://lists.wispa.org/mailman/listinfo/wireless > >
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