Messages in this thread | | | From | "Alan Curry" <> | Subject | Re: Pty is losing bytes | Date | Tue, 15 Feb 2005 15:06:33 -0500 (EST) |
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Linus Torvalds writes the following: > >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? If so, that means >that the pty code has _claimed_ to have written 4kB, and only ever wrote >4kB-1 bytes. That in turn implies that "ldisc.receive_room()" disagrees >with "ldisc.receive_buf()". >
That does fix it for me, in 2.6.10-as3 (the -as3 patch doesn't touch anything near the pty code, so it should be good for vanilla 2.6.10 too).
I noticed while testing that the "lost byte" is occasionally more than one byte. It's always one byte at the 4k mark, but sometimes a larger group of bytes is lost around the 8k mark, and (more rarely) an even larger group of bytes is lost at the 12k mark.
$ ls -l /etc/mime.types -rw-r--r-- 1 root root 15723 Apr 9 2002 /etc/mime.types $ while :; do ./ptytest < /etc/mime.types | wc -c ; sleep 1 ; done 15722 15710 15722 15710 15722 15710 15722 15722 15682 (and so on)
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