On 2019-09-18 17:59, Toke Høiland-Jørgensen wrote:
Yibo Zhao <yiboz@xxxxxxxxxxxxxx> writes:
Not long after the start of multi-clients test, not a single station
is
an eligible candidate for transmission since global virtual time(g_vt)
is
smaller than the virtual airtime(s_vt) of all the stations. As a
result,
the Tx has been blocked and throughput is quite low.
This may mainly due to sync mechanism and accumulative deviation from
the
devision calculation of g_vt.
For example:
Suppose we have 50 clients in first round.
Round 1:
STA weight Tx_time_round wt_sum s_vt g_vt valid_for_next_Tx
. . . . .
. . . . .
. . . . .
After this round, all the stations are not valid for next transmission
due
to accumulative deviation.
And if we add a new #51,
Round 2:
STA weight Tx_time_round wt_sum s_vt g_vt valid_for_next_Tx
. . . . .
. . . . .
. . . . .
Sync is done by:
max(g_vt of last round - grace period, s_vt)
and s_vt of #51 = max(2000 - 500, 0) + 1024 = 2524, and it is more
than the
final g_vt of this round.
After this round, no more station is valid for transmission.
I'm not sure I understand this. Was there supposed to be numbers in
those tables above?
Yes, it looks like there are some display issues. Will fix it in next
version.
-Toke
--
Yibo
