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From:   Toke =?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= <toke@redhat.com>
To:     Yibo Zhao <yiboz@codeaurora.org>, ath10k@lists.infradead.org
Cc:     linux-wireless@vger.kernel.org, Yibo Zhao <yiboz@codeaurora.org>
Subject: Re: [PATCH V2 3/4] mac80211: fix low throughput in multi-clients situation
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Yibo Zhao <yiboz@codeaurora.org> 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=09weight=09Tx_time_round  wt_sum=09s_vt=09g_vt  valid_for_next_Tx
> .=09.=09.=09=09=09.=09=09.
> .=09.=09.=09=09=09.=09=09.
> .=09.=09.=09=09=09.=09=09.
>
> After this round, all the stations are not valid for next transmission du=
e
> to accumulative deviation.
>
> And if we add a new #51,
> Round 2:
> STA=09weight=09Tx_time_round=09wt_sum  s_vt=09g_vt  valid_for_next_Tx
> .=09.=09.=09=09=09.=09=09.
> .=09.=09.=09=09=09.=09=09.
> .=09.=09.=09=09=09.=09=09.
>
> Sync is done by:
> max(g_vt of last round - grace period, s_vt)
> and s_vt of #51 =3D max(2000 - 500, 0) + 1024 =3D 2524, and it is more th=
an 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?

-Toke