Hello all,

I had problem to create a patch - the command didn't finish for long long time.
I tried to do it manualy step by step from command line and it seems
that the problem is with "cp" command.
This is method how to repeat it:

I have in my home dir prepared new version of tftpd.c

ls -l $home/src/tftpd
--rw-rw-r-- M 40 antonin antonin 7708 Sep 11 14:59
/usr/antonin/src/tftpd/tftpd.c

1. bind -b -c $home/src/tftpd /sys/src/cmd/ip
2. 9fs sources
3. cp /sys/src/cmd/ip/tftpd.c /n/sources/patch/tftpd-error
...and now it hangs.

If I copy to /n/sources regular file, things go right.
If I try to copy file from bind-ed dir, "cp" hangs.

Maybe I am somewhere wrong, I am not sure.

Antonin

I created a patch yesterday and it worked fine. It is fairly slow as it
diff's all the files you have changed with those on sources.

Sadly the 9p protocol is quite badly effected by high (intercontinential) RTTs.

-Steve

On Fri, Sep 12, 2008 at 9:54 AM, Steve Simon quintile.net> wrote:

There were only 2 files in the patch. I wait for about 10 minutes and nothing.
But then I tried to copy a file from command line.
If I copied an ordinary file (to /n/sources) it was done immediately.
But If I copied a file from bind-ed(!) directory it was endless...
There was no diff, only copy file.

Antonin

i would guess the problem is a bit different. i'm assuming that
reads from sources work fine. it's not until you try to write there
that there's a problem.

On Fri, Sep 12, 2008 at 1:47 PM, erik quanstrom quanstro.net> wrote:

traditional path mtu uses icmp messages. if your router/modem/whatever
eats icmp, you're outta luck with these traditional methods.
cf. http://www.netheaven.com/pmtu.html i think there are some tricks
to get around the missing icmp messages, though.

have you tried mounting sources from these machines?

i think this problem is pecular to sources. if the pmtu is
symmetric, it seems sources is a few bytes short of a full packet.
1510 bytes. yet when i read from a local machine, the tcp
packets are a bit long of a full packet