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SubjectPre7 & Pre8: Heavy Context Switching in XFree86
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Beginning with 2.2.0pre7 I have started to see a lot of context switching
being reported by vmstat on a completely idle pII 450 ASUS P2B system:

procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
1 0 0 0 67372 3388 27616 0 0 0 2 107 15214 14 41 46
1 0 0 0 67372 3388 27616 0 0 0 0 109 176 2 0 98
1 0 0 0 67372 3388 27616 0 0 0 0 114 21686 19 35 47
1 0 0 0 67372 3388 27616 0 0 0 0 119 270 2 0 98
0 0 0 0 67368 3388 27616 0 0 0 0 104 24265 23 28 50
1 0 0 0 67368 3388 27616 0 0 0 0 114 218 2 0 98
0 0 0 0 67368 3388 27616 0 0 0 0 108 23272 15 34 51
1 0 0 0 67368 3388 27616 0 0 0 0 101 112 0 1 99
0 0 0 0 67360 3392 27616 0 0 2 0 106 21869 15 32 53
1 0 0 0 67360 3392 27616 0 0 0 0 107 155 1 2 97
0 0 0 0 67360 3392 27616 0 0 0 0 115 18776 16 29 55
1 0 0 0 67360 3392 27616 0 0 0 0 111 190 0 1 99
0 0 0 0 67360 3392 27616 0 0 0 0 119 17090 15 28 57
2 0 0 0 67356 3392 27616 0 0 0 0 173 403 1 1 98
1 0 0 0 67360 3392 27616 0 0 0 1 290 9471 11 33 56
1 0 0 0 67360 3392 27616 0 0 0 0 255 12671 14 28 58
2 0 0 0 67360 3392 27616 0 0 0 0 185 20468 8 36 56
5 0 0 0 67360 3392 27616 0 0 0 0 107 19988 13 28 59
3 0 0 0 67356 3392 27616 0 0 0 0 115 16488 11 27 62
2 0 0 0 67360 3392 27616 0 0 0 0 123 1277 3 3 94
0 0 0 0 67356 3392 27616 0 0 0 0 123 13236 16 19 65

Rebooting to pre6 and this goes away completely.

System info:

gomer:~$ uname -a
Linux gomer.mlink.net 2.2.0-pre8 #1 Tue Jan 19 06:58:56 EST 1999 i686
unknown
gomer:~$ gcc -v
Reading specs from
/usr/lib/gcc-lib/i686-unknown-linux-gnulibc1/2.7.2.3/specs
gcc version 2.7.2.3

/usr/src/linux/.config:

#
# Processor type and features
#
# CONFIG_M386 is not set
# CONFIG_M486 is not set
# CONFIG_M586 is not set
# CONFIG_M586TSC is not set
CONFIG_M686=y
CONFIG_X86_WP_WORKS_OK=y
CONFIG_X86_INVLPG=y
CONFIG_X86_BSWAP=y
CONFIG_X86_POPAD_OK=y
CONFIG_X86_TSC=y
CONFIG_X86_GOOD_APIC=y
# CONFIG_MATH_EMULATION is not set
CONFIG_MTRR=y
# CONFIG_SMP is not set

gomer:~$ uptime
7:42am up 0:08, 8 users, load average: 0.78, 0.53, 0.26

Running XFree86 3.3.2 with XF86_SVGA driver (Riva TNT) and doing nothing
significant at all.

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================================================================
| Greg Patterson | EMAIL: gomer@gomer.mlink.net |
| | gomer@mlink.net |
| Step aside Microsoft, | IRC: Wizird (EFNET) |
| Linux is here to stay. | WWW: http://gomer.mlink.net/~root |
================================================================

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