Re: Serial device with very large buffer

[Joe deBlaquiere <jadb@redhat.com>]

Hi Alex!

	I'm a little confused here... why are we overrunning? This thing is 
running externally at 19200 at best, even if it does all come in as a 
packet. I would think the flip buffer would never contain more than a 
few characters. Are you running it at a higher rate internally? Does it 
buffer up a whole packet if you do this?

Wouldn't it be a little easier to drop somthing like "AT#MRU=500\r" to 
the modem than to change the tty driver?

-- 
Joe

Alex Belits wrote:

> On Thu, 1 Feb 2001, Alan Cox wrote:
> 
> 
>>>   I also propose to increase the size of flip buffer to 640 bytes (so the
>>> flipping won't occur every time in the middle of the full buffer), however
>>> I understand that it's a rather drastic change for such a simple goal, and
>>> not everyone will agree that it's worth the trouble:
>> 
>> Going to a 1K flip buffer would make sense IMHO for high speed devices too
> 
> 
> 1K flip buffer makes the tty_struct exceed 4096 bytes, and I don't think,
> it's a good idea to change the allocation mechanism for it.



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