D-BUS support

D-BUS support

[Marco d'Itri]

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I'm attaching a small patch which fixes a build error when dbus support
is enabled.

BTW, I noticed that when dbus support is enabled udev becomes much
slower (is this a serialization side effect of the dbus daemon?):

# time /etc/init.d/udev start
Creating initial udev device nodes...done.

real	0m32.795s
user	0m0.314s
sys	0m0.376s
#

I can see with ps that there are a big number of processes waiting to
complete, and I verified with strace that they are waiting for a reply
from the dbus daemon, e.g.:

root@wonderland:/USR3/src/P/udev/udev-0.014# strace -v -p 14583
Process 14583 attached - interrupt to quit
select(4, [3], [], [3], NULL)           = 1 (in [3])
read(3, "OK\r\n", 2048)                 = 4
select(4, [], [3], [3], NULL)           = 1 (out [3])
write(3, "BEGIN\r\n", 7)                = 7
writev(3, [{"l\1\0\0x\0\0\0\0\0\0\0\1\0\0\0\1o\0\0\25\0\0\0/org/fre"..., 120}, {"", 0}], 2) = 120
gettimeofday({1074981742, 670060}, NULL) = 0
select(4, [3], [], [3], {15, 0})        = 1 (in [3], left {0, 98000})
read(3, 0x805c250, 2048)                = -1 ECONNRESET (Connection reset by peer)
close(3)                                = 0
gettimeofday({1074981757, 578538}, NULL) = 0
open("/udev/.udev.tdb", O_RDWR|O_CREAT, 0644) = 3
[...]

Looks like it's even timing out from time to time:

root@wonderland:/USR3/src/P/udev/udev-0.014# dpkg -i ../udev_0.014-1_i386.deb
(Lettura del database ... 98030 file e directory attualmente installati.)
Preparativi per il rimpiazzo di udev 0.014-1 (usando ../udev_0.014-1_i386.deb) ...
Spacchetto il rimpiazzo di udev ...
Configuro udev (0.014-1) ...
Installo la nuova versione del file di configurazione /etc/init.d/udev ...
Restarting system message bus: dbus-1.
Creating initial udev device nodes...cannot acquire org.kernel.udev service, error org.freedesktop.DBus.Error.NoReply: Message did not receive a reply'done.

root@wonderland:/USR3/src/P/udev/udev-0.014#


-- 
ciao, |
Marco | [4290 st4MxE3BJ1VvA]

[-- Attachment #2: dbus_missing_include.diff --]
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diff -ruN udev-014.orig/udev_dbus.c udev-014/udev_dbus.c
--- udev-014.orig/udev_dbus.c	2003-12-29 20:28:21.000000000 +0100
+++ udev-014/udev_dbus.c	2004-01-24 22:43:25.000000000 +0100
@@ -12,6 +12,7 @@
 #include "udev.h"
 #include "udev_version.h"
 #include "udev_dbus.h"
+#include "logging.h"
 
 
 /** variable for the connection the to system message bus or #NULL

Re: D-BUS support

[Ross Burton]

On Sat, 2004-01-24 at 23:02, Marco d'Itri wrote:
> # time /etc/init.d/udev start
> Creating initial udev device nodes...done.
> 
> real	0m32.795s
> user	0m0.314s
> sys	0m0.376s
> #

For me (700MHz laptop) I get these results:

# time /etc/init.d/udev start
Creating initial udev device nodes...done.
/dev management daemon (udev) enabled.
 
real    0m5.447s
user    0m1.459s
sys     0m2.401s

> I can see with ps that there are a big number of processes waiting to
> complete, and I verified with strace that they are waiting for a reply
> from the dbus daemon, e.g.:
[snip]

I do see this thought.

> Looks like it's even timing out from time to time:
[snip]
> Creating initial udev device nodes...cannot acquire org.kernel.udev service, error org.freedesktop.DBus.Error.NoReply: Message did not receive a reply'done.

And that as well.

Ross
-- 
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Re: D-BUS support

[Marco d'Itri]

On Jan 25, Ross Burton <ross@burtonini.com> wrote:

 >For me (700MHz laptop) I get these results:
 >
 ># time /etc/init.d/udev start
 >Creating initial udev device nodes...done.
 >/dev management daemon (udev) enabled.
 > 
 >real    0m5.447s
 >user    0m1.459s
 >sys     0m2.401s

How many nodes do you have?

md@wonderland:~$ find /udev/ -type b -or -type c | wc -l
103
md@wonderland:~$

-- 
ciao, |
Marco | [4299 aszI.AznZHV1Y]


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Re: D-BUS support

[Ross Burton]

On Sun, 2004-01-25 at 13:47, Marco d'Itri wrote:
> On Jan 25, Ross Burton <ross@burtonini.com> wrote:
>  >For me (700MHz laptop) I get these results:
>  ># time /etc/init.d/udev start
>  >Creating initial udev device nodes...done.
>  >/dev management daemon (udev) enabled.
>  > 
>  >real    0m5.447s
>  >user    0m1.459s
>  >sys     0m2.401s
> 
> How many nodes do you have?
> 
> md@wonderland:~$ find /udev/ -type b -or -type c | wc -l
> 103
> md@wonderland:~$

$ find /udev/ -type b -or -type c | wc -l
411
$

Of couse that does include 256 rfcomm devices:

$ find /udev/ -type b -or -type c | grep -v rfcomm | wc -l
155

Ross
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Re: D-BUS support

[Marco d'Itri]

On Jan 27, David Zeuthen <david@fubar.dk> wrote:

 >> Creating initial udev device nodes...cannot acquire org.kernel.udev service, error org.freedesktop.DBus.Error.NoReply: Message did not receive a reply'done.
 >> 
 >
 >I've seen this behaviour when the system message bus (dbus-daemon-1
 >--system) isn't running or the udev policy file for the system message
 >bus is missing. It seems you're experiencing the latter
No, the file is there and the daemon is running.
If I stop the daemon then udev is quick again.
The error does not always happen, only a few times. Maybe the accept
queue for the daemon is not large enough?

-- 
ciao, |
Marco | [4335 di6A/vxQDzrt2]


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