From: Andreas Schwab <schwab@suse.de>
To: Linus Torvalds <torvalds@osdl.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Pty is losing bytes
Date: Tue, 15 Feb 2005 21:30:06 +0100 [thread overview]
Message-ID: <je1xbhy3ap.fsf@sykes.suse.de> (raw)
In-Reply-To: <Pine.LNX.4.58.0502151053060.5570@ppc970.osdl.org> (Linus Torvalds's message of "Tue, 15 Feb 2005 11:08:07 -0800 (PST)")
Linus Torvalds <torvalds@osdl.org> writes:
> I think it may be a n_tty line discipline bug, brought on by the fact that
> the PTY buffering is now 4kB rather than 2kB. 4kB is also the
> N_TTY_BUF_SIZE, and if n_tty has some off-by-one error, that would explain
> it.
I've also seen more than one byte missing. For example when sending a big
chunk of bytes down the pty via an Emacs *shell* buffer up to 16 bytes are
missing somewhere in the middle.
> Does the problem go away if you change the default value of "chunk" (in
> drivers/char/tty_io.c:do_tty_write) from 4096 to 2048?
Yes, that helps.
Andreas.
--
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
next prev parent reply other threads:[~2005-02-15 20:36 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-15 0:54 Pty is losing bytes Andreas Schwab
2005-02-15 19:08 ` Linus Torvalds
2005-02-15 19:44 ` Linus Torvalds
2005-02-15 22:13 ` Alan Cox
2005-02-15 19:58 ` Sergey Vlasov
2005-02-15 20:13 ` Sergey Vlasov
2005-02-15 20:06 ` Alan Curry
2005-02-15 20:30 ` Andreas Schwab [this message]
2005-02-15 20:56 ` Linus Torvalds
2005-02-15 21:54 ` Andreas Schwab
2005-02-16 3:12 ` Roman Zippel
2005-02-16 4:05 ` Linus Torvalds
2005-02-16 14:42 ` Theodore Ts'o
2005-02-16 16:06 ` Linus Torvalds
2005-02-17 4:44 ` Theodore Ts'o
2005-02-17 15:45 ` Linus Torvalds
2005-02-18 16:32 ` Theodore Ts'o
2005-02-16 19:49 ` Roman Zippel
2005-02-16 19:58 ` Linus Torvalds
2005-02-16 22:46 ` Andrew Morton
-- strict thread matches above, loose matches on Subject: below --
2005-02-15 2:00 Alex Davis
2005-02-15 10:48 ` Andreas Schwab
2005-02-15 11:01 ` Jan De Luyck
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