linux serial buffer question

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Eric Spaulding Contact options for registered users 's Avatar (by Gravatar) posted on
November 30, 2004, 4:54 pm
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Is there an easy way to increase my receive serial buffer in linux?  It
looks like it's currently set at 4096 bytes.  I'm using pyserial +
python and would like to read larger chunks than this at one time.

Thanks for any help,
-es

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Grant Edwards Contact options for registered users 's Avatar (by Gravatar) posted on
November 30, 2004, 5:10 pm
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Re: linux serial buffer question

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You'd have to rebuild the kernel after modifying the sources to
the tty line discipline module.

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Right. The last time I looked it's set to one page.  On IA32
that's 4K.

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Why not wrap the read() method in three lines of python to keep
calling read() until you get the desired amount of data?  Just
subclass the serial port object, override the read() method
with a loop that calls the super's read.

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Eric Spaulding Contact options for registered users 's Avatar (by Gravatar) posted on
November 30, 2004, 5:14 pm
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Re: linux serial buffer question
I don't know, 3 lines sounds like an awful lot *grin*.

Ok, I'll work with what I've got.  Thanks!



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Grant Edwards Contact options for registered users 's Avatar (by Gravatar) posted on
November 30, 2004, 6:07 pm
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Re: linux serial buffer question

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[...]

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There is one case where my suggestion isn't a substitute for
larger buffers.  If the data is being sent when your
application ready for it (it isn't calling read()), you would
need larger buffers to prevent data loss or flow-control
kicking in.

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