Mikrotik 10g switch10/22/2023 ![]() What is the hardware buffer size in CRS/CSS 3xx series switches? CPU in a CRS is too weak to handle much traffic, so larger queues possible in RouterOS don't help. So the issue gets worse when traffic comes over the Internet and/or over wireless networks (often much longer RTT compared to a wired LAN). Rule of thumb for the best throughput of a TCP flow is the RTT multiplied by the data rate. ![]() Software queues in RouterOS are usually large enough, but hardware (such as a switch chip) is limited, and higher speeds need larger buffers (but not too large - bufferbloat is bad too). ![]() Could the performance issues be caused by bursty traffic and too small buffers in the switch? So the traffic is below 1 Gb/s on average, but comes in short 10 Gb/s bursts that overflow a too small buffer resulting in packet loss? The issue is not theoretical, I've seen it already a few times in cases like traffic enters a gigabit switch port and leaves through a 100 Mb port (or a 300 Mb microwave link).
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