Hi *,
I've installed dosemu-0.99.10.0 on my RH5.2 box, the kernel
upgraded to 2.2.5, and started xdos, with in the configuration file:
$_rdtsc = (on) # if possible use Pentium cycle counter
$_hogthreshold = (100) # 0 == all CPU power to DOSEMU
$_com1 = "/dev/vmodem" # e.g. "/dev/mouse" or "/dev/cua0"
This xdos seems to slow down the system much, even when at the DOS
prompt doing nothing: dragging a window on my K6-2 333Mhz 128Mb slows
down alot [gfx card: Matrox G200], it looks like it spends a lot of
time in kernel space since it is not traceable with top.
strace -p1347 (xdos pid) gives some strange results:
read(12, 0x81a4e99, 128) = -1 EAGAIN (Resource temporarily unavailable)
SYS_166(0x1, 0x8106d44, 0x71000, 0xfff8eff1, 0x804bd00) = -1 ENOSYS (Function not
implemented)
SYS_166(0x1, 0x8106d44, 0x71000, 0xfff8eff1, 0x804bd00) = -1 ENOSYS (Function not
implemented)
gettimeofday({924722631, 925637}, NULL) = 0
read(12, 0x81a4e99, 128) = -1 EAGAIN (Resource temporarily unavailable)
SYS_166(0x1, 0x8106d44, 0x71000, 0xfff8eff1, 0x804bd00) = -1 ENOSYS (Function not
implemented)
SYS_166(0x1, 0x8106d44, 0x71000, 0xfff8eff1, 0x804bd00) = -1 ENOSYS (Function not
implemented)
gettimeofday({924722631, 926267}, NULL) = 0
read(12, 0x81a4e99, 128) = -1 EAGAIN (Resource temporarily unavailable)
etc.
[root@k6 fd]# ls -l /proc/1347/fd/12
lrwx------ 1 root root 64 Apr 21 21:30 /proc/1347/fd/12 -> /dev/vmodem
..so it's polling the COM port for no reason. Someone knows why?
After removal of the offending com line in /etc/dosemu.conf, the
system stays just as slow, but strace now gives:
SYS_166(0x1, 0x8106d44, 0x70000, 0xfff8fff1, 0x804bd00) = -1 ENOSYS (Function not
implemented)
SYS_166(0x1, 0x8106d44, 0x70000, 0xfff8fff1, 0x804bd00) = -1 ENOSYS (Function not
implemented)
SYS_166(0x1, 0x8106d44, 0x70000, 0xfff8fff1, 0x804bd00) = -1 ENOSYS (Function not
implemented)
SYS_166(0x1, 0x8106d44, 0x70000, 0xfff8fff1, 0x804bd00) = -1 ENOSYS (Function not
implemented)
gettimeofday({924723197, 781803}, NULL) = 0
etc.
It seems like this SYS_166 is the offending system call. Anyone knows
what SYS_166 is supposed to do?
Regards,
Rutger.
--
Rutger Nijlunsing, rutger @ null.net ----------------------------- Linux! --
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