---
** [tickets:#3100] mds: Sending burst of message cause the window size out of
range**
**Status:** assigned
**Milestone:** 5.19.10
**Created:** Wed Oct 16, 2019 03:27 AM UTC by Minh Hon Chau
**Last Updated:** Wed Oct 16, 2019 03:27 AM UTC
**Owner:** Minh Hon Chau
According to RFC1982: "Addition of a value outside the range [0 ..
(2^(SERIAL_BITS - 1) - 1)] is undefined."
mds uses 16 bits for mds flow control, thus the maximum allowed range of window
size is 2^15 - 1 = 32767.
The 'mdstest 27 8' has randomly hit this limitation with the counter errors
that is detected in mds
<139>1 2019-10-15T16:01:33.167022+02:00 SC-1 mdstest 3312 mds.log [meta
sequenceId="84483"] FCTRL: [me] <-- [node:1001001, ref:2784751213],
RcvChkAck[fseq:31067, chunk:3], sndwnd[acked:31064, send:63850,
nacked:1901634], queue[size:32785], Error[msg disordered]
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