Re: [hybi] Flow control quota

["Arman Djusupov" <[e-mail]>]

When the per-frame compression extension is being used on a logical channel,
it is impossible to create a frame of exactly the desired size. A few bytes
of quota will always be unutilized unless some padding is used. The mux
specification prohibits sending frames bigger than the available quota. When
per-frame compression is applied on the payload before mux, this payload
cannot be fragmented any more. Even if we make compression extension mux
aware, it cannot produce a 1 byte compressed frame, it can only flag a frame
as uncompressed and simply send 1 byte. In general, sending 1 byte in a
separate frame is not desirable.

Extensions that set RSV bits prohibit frame fragmentation. This causes a
general incompatibility issue with mux FC when an extension is applied
before the mux. We need to consider whether there is a solution to this.

With best regards,
Arman

-----Original Message-----
From: Martin Sustrik [mailto:[e-mail]] 
Sent: Thursday, May 31, 2012 11:59 AM
To: Arman Djusupov
Cc: 'Takeshi Yoshino'; [e-mail]
Subject: Re: [hybi] Flow control quota

On 30/05/12 15:36, Arman Djusupov wrote:

> Sometimes the sending side cannot fully utilize the remaining quota 
> available (a typical example is when the remaining quota is too small)

That's interesting. Can you provide a concrete example?

It seems to me that even if the quota is 1 byte, you can send a frame with 1
byte.

Martin