Maxim Dounin wrote in post #994792:
> No, nginx passes downstream chain of buffers, not a single buffer.

I understand this, but I don't understand how there can be more than 1
buffer at a time that's only partially passed downstream. I had in mind
that it works like this:

Suppose that Nginx is configured with 4 buffers, each 100 bytes in size.
The upstream response is 400 bytes.
Bytes 0-99 from the response are put in buffer 1, bytes 100-199 are put
in buffer 2, bytes 200-299 are put in buffer 3, bytes 300-399 are put in
buffer 4.
Nginx flushes buffer 1 downstream, thus buffer 1 is now a "busy buffer"
while all the other ones are not. Only when buffer 1 is entirely flushed
will Nginx continue to flush buffer number 2 (buffer 1 is now marked
"ready" of some sort so that it may be reused.)

How can there be multiple busy buffers? Is my description correct?

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