On 4/7/20 2:50 AM, Ulrich Windl wrote:
Andrei Borzenkov <[email protected]> schrieb am 06.04.2020 um 22:10 in
Nachricht
<17546_1586203904_5E8B8D00_17546_12_1_73cdd72d-c884-05a4-6c64-2e354912c28f@gmail
com>:
[...]
I cannot reproduce it, but I also do not use knet. From documentation I
have impression that knet has artificial delay before it considers links
operational, so may be that is the reason.
[...]
NICs may behave quite different: I can remember som early 1Gb model needing
almost 5 seconds to negotiate a link with the switch, and the link went up/down
at least twice while doing so. Recent NICs seem somewhat faster, but I think
something in the 3-second area is still realistic. Maybe software waits a short
while until it trusts the NIC status. I don't know...
Ulrich,
it doesn't take quite that long for KNET to "settle", but critically it
appears to take longer than the qnet negotiation.
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