On 11/7/2016 10:40 AM, Josh Reynolds wrote:
Negative, layer2 flow control is an axe when you need a scalpel. Turn it off everywhere!Layer3 has automatic mechanisms to help handle bandwidth saturation, and packet loss is part of that process. Furthermore, proper ToS/DSCP queueing is equally important.
Well, technically no, Layer 3 has NO mechanisms to deal with capacity. It was a known issue among the network working group members in 1973 and a known issue in 1974 when TCP v1 was written, but the team had turned over by 1978 when TCP/IPv4 came out, and that group forgot about it until 1986 when things fell apart. The temporary short-term not very good fix was in layer 4 (TCP Slow Start) and that doesn't even apply to all streaming, though many do cooperate. Of course it was "good enough", so 30 years later it is taken as gospel. TCP/IP is the /chabuduo /of protocol stacks.
There could be issues with using flow control on the Ethernet port, but really flow control should have been part of every layer. Loss should generally be localized.
On Nov 7, 2016 9:36 AM, "Judd Dare" <judd.d...@gmail.com
<mailto:judd.d...@gmail.com>> wrote:
So you're saying, make sure Flow Control is enabled on the ports?
On Mon, Nov 7, 2016 at 8:22 AM, Josh Reynolds
<j...@kyneticwifi.com <mailto:j...@kyneticwifi.com>> wrote:
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
<mailto: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?
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