Recent changes to patches

tunctl add group support

Alon Bar-Lev — Thu, 01 Nov 2007 17:21:26 -0000

Add support for -g (group) parameter to set permission of group
based.

file.c append support

Ted Winograd — Sat, 03 Mar 2007 19:51:25 -0000

As of Kernel 2.6.20.1, UML's os-Linux/file.c does not pass on the append flag to the open() call. This patch adds a check for flags.a.

uml-utilities usage string

Luca Ferroni — Tue, 13 Sep 2005 10:24:37 -0000

This terrible patch add COW version 3 support for the
uml_moo usage string :)

tunctl tun interface support

Simone Vellei — Mon, 17 Jan 2005 20:31:57 -0000

This patch includes the support in tunctl for the
distinction of the interface type (tun or tap),
therefore tunctl could be used in order to create
persistent tun interfaces for other software (eg. qemu).

Sorry for the double submission...I have forgotten the
login...

tunctl tun interface support

Anonymous — Mon, 17 Jan 2005 20:25:55 -0000

SYSEMU Performance Patch for reducing context switches

Anonymous — Thu, 20 May 2004 13:32:39 -0000

see:
http://perso.wanadoo.fr/laurent.vivier/UML/

this patch reduces the context switch rate on your host
system and gives a performance benefit for uml.

The patch is similar to skas: it needs the UML _AND_
the HOST to be patched.

some tests for comparison

"GETPID LOOP" (worst case-/no "real world"-scenario)
------- getpid.c -------------
#include <stdio.h>

int main(int argc, char** argv)
{
int i;
int loop = atol(argv[1]);

for (i = 0; i < loop; i++)
{
getpid();
}
}
-----------------------------

time ./getpid 10000000

native speed on HOST:
----------------------
real 0m7.920s
user 0m3.990s
sys 0m3.940s

UML w/o sysemu:
-----------------
real 6m16.956s
user 0m5.250s
sys 0m58.462s

real 6m17.126s
user 0m4.846s
sys 1m1.731s

real 6m16.461s
user 0m5.077s
sys 0m59.365s

UML with sysemu:
-----------------
real 3m55.052s
user 0m5.962s
sys 0m46.385s

real 3m56.964s
user 0m5.846s
sys 0m42.635s

real 3m54.179s
user 0m5.981s
sys 0m47.154s
---------------------------------------

KERNEL COMPILE:
-----------------

UML w/o sysemu:
-----------------
time make dep > /dev/null

real 4m51.669s
user 0m37.462s
sys 0m51.846s

time make bzImage modules > /dev/null

real 13m35.457s
user 4m18.885s
sys 1m40.481s

UML with sysemu:
-----------------
time make dep > /dev/null

real 3m52.486s
user 0m37.981s
sys 0m50.808s

time make bzImage modules > /dev/null

real 13m5.980s
user 4m18.096s
sys 1m40.115s

(Tests have been made by Laurent with 2.4 Kernel)

This patch needs testing - please post further
performance comparisons (some graphs?) !
:)

uml patch for 2.6.6 kernel

Anonymous — Wed, 19 May 2004 19:44:08 -0000

see information on:
http://www.user-mode-linux.org/~blaisorblade/

skas patch for 2.6.6 kernel

Anonymous — Wed, 19 May 2004 19:36:00 -0000

is at:
http://www.user-mode-linux.org/~blaisorblade/patches/host-skas3-2.6.6-v1.patch

Fake serial number for fake HD

Anonymous — Mon, 12 Apr 2004 15:57:09 -0000

Look! It's a fake hard disk:

# hdparm -i /dev/hda

/dev/hda:

Model=, FwRev=, SerialNo=HC40SJE1
...

Just like a real hard disk:

# hdparm -i /dev/hde

/dev/hde:

Model=Maxtor 6Y080L0, FwRev=YAR41BW0, SerialNo=Y2QTHC9E
...

Brilliant!

The serial number is based on the inode of the image
file (or COW file).

host-skas3 for 2.6.3 through 2.6.5

Anonymous — Tue, 06 Apr 2004 22:49:46 -0000

This patch has been working for me on 2.6.3 and I just
applied to 2.6.5 and all looks good. I took Bryan
O'Sullivan's' 2.6.0-test3 fixup from
http://article.gmane.org/gmane.linux.uml.devel/1680 and
cleaned up the fuzz and rejects. Any credit due me is
basically that I can read .rej files & type them back
in the correct place ;)