[Vserver] vserver cpu scheduling

From: Andreas Baetz <lac01_at_web.de>
Date: Tue 21 Nov 2006 - 09:05:07 GMT
Message-Id: <200611211005.07723.lac01@web.de>

Hi,

I updated to another kernel (2.6.18.2) and another vserver version (vs2.0.2.2-rc6), and I think
the hard cpu scheduling doesn't work as expected.

What I'm trying to do is to limit the CPU cycles for xid 8004 (deb4).

In vserver 8004 the following command is running:

cat /dev/zero | gzip | gzip | gzip > /dev/null

vtop shows:
top - 09:55:24 up 18:05, 11 users, load average: 1.12, 0.67, 0.33
Tasks: 167 total, 3 running, 164 sleeping, 0 stopped, 0 zombie
Cpu(s): 86.4%us, 13.3%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.3%hi, 0.0%si, 0.0%st
Mem: 904876k total, 875096k used, 29780k free, 131580k buffers
Swap: 1003960k total, 0k used, 1003960k free, 355168k cached

  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
14417 root 25 0 1820 656 276 R 91.1 0.1 2:26.04 gzip

According to the shedule (see below), the CPU should be limited to 100*3/20 = 15 %

additional info:

host:/tmp# vserver --version
vserver 0.30.211 -- manages the state of vservers
This program is part of util-vserver 0.30.211

Copyright (C) 2003,2004,2005 Enrico Scholz
This program is free software; you may redistribute it under the terms of
the GNU General Public License. This program has absolutely no warranty.

host:/tmp# bash ./testme.sh-0.16 -v
Linux-VServer Test [V0.16] Copyright (C) 2003-2006 H.Poetzl
chcontext is working.
chbind is working.
chcontext 0.30.211 -- allocates/enters a security context
This program is part of util-vserver 0.30.211

Copyright (C) 2004 Enrico Scholz
This program is free software; you may redistribute it under the terms of
the GNU General Public License. This program has absolutely no warranty.
Linux 2.6.18.2-vs2.0.2.2-rc6.061120 #1 PREEMPT Mon Nov 20 15:33:17 CET 2006 i686
Ea 0.30.211 273/glibc (DSa) <compat,v11,fscompat,v13,net,oldproc,olduts>
VCI: 0002:0002 273 03000036 (TbLgnP)
(root@host)
(gcc version 4.1.2 20061115 (prerelease)
(Debian 4.1.1-20))
#1 PREEMPT Mon Nov 20 15:33:17 CET 2006

---
# chcontext  true && chcontext --xid 45678 true
# succeeded.
# chcontext --xid 45678 egrep 'context|VxID' /proc/self/status
# succeeded.
# chcontext --secure --xid 45678 mknod /tmp/testme.sh-0.16.cB7844/node c 0 0
# succeeded.
# chcontext  --hostname zaphod.7841 uname -a | grep -q zaphod.7841
# succeeded.
# chbind  --ip 192.168.0.42 true
# succeeded.
# chbind  --ip 192.168.0.1/255.255.255.0 --ip 10.0.0.1/24 true
# succeeded.
# chcontext --xid 45678 --flag fakeinit bash -c 'test $$ -eq 1'
# succeeded.
# chcontext  --flag fakeinit bash -c 'test $$ -eq 1'
# succeeded.
host:/tmp# vserver-stat
CTX   PROC    VSZ    RSS  userTIME   sysTIME    UPTIME NAME
0      151   1.3G 547.1M   1h31m06   9m29s29  16h20m45 root server
1        1   2.2M   1.1M   0m03s11   0m04s68  45m04s93 monitoring server
8003     8 118.8M  37.8M   1m32s14   0m13s57  16h18m07 deb3
8004     7    23M   7.4M   0m00s30   0m00s00  43m14s33 deb4
host:/tmp# cat /etc/vservers/deb4/flags
sched_hard
host:/tmp# cat /etc/vservers/deb4/schedule 
3
20
500
10
500
0
host:/tmp# cat /proc/virtual/8004/status
UseCnt:	30
Tasks:	11
Flags:	0000000202020110
BCaps:	00000000344c04ff
CCaps:	0000000000000101
Ticks:	0
host:/tmp# cat /proc/virtual/8004/sched
Token:		     500
FillRate:	       3
Interval:	      20
TokensMin:	      10
TokensMax:	     500
PrioBias:	       0
VaVaVoom:	       0
cpu 0: 0 0 0
host:/tmp# uname -a
Linux host 2.6.18.2-vs2.0.2.2-rc6.061120 #1 PREEMPT Mon Nov 20 15:33:17 CET 2006 i686 GNU/Linux
host:/tmp#  grep -i vserver /usr/src/linux-2.6.18.2/.config
# Linux VServer
CONFIG_VSERVER_LEGACY=y
# CONFIG_VSERVER_LEGACY_VERSION is not set
CONFIG_VSERVER_LEGACYNET=y
CONFIG_VSERVER_PROC_SECURE=y
CONFIG_VSERVER_HARDCPU=y
# CONFIG_VSERVER_HARDCPU_IDLE is not set
# CONFIG_VSERVER_DEBUG is not set
CONFIG_VSERVER=y
CONFIG_VSERVER_SECURITY=y
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