I find that when comparing kernels 1.3.72 and 1.3.85, the latter
exhibits severe interactive slowness over CSLIP and PPP connections.
When I use minicom to dial into the same system, there is no noticable
lag when echo'ing typed characters.
Furthermore, all this talk about Solaris 2 vs. SunOS 4.1 is irrelevant
in my case: I'm connecting (with CSLIP) to a Xylogics Micro Annex
(where I can then login to either a SunOS 4.1 or Solaris 2 hosts, both
of which behave the same). Btw, since the Micro Annex doesn't
support PPP, I tested PPP to an ISP (slip.net). The interactive
response was worse than CSLIP, but that's probably because of the load
on the remote machine (as PPP with 1.3.72 is also worse than CSLIP to
my Micro Annex).
The problem is not line noise, either. I've run the tests too many
times (at least 30 times). 100% of the time with kernels after 1.3.72
I experience the problem, and 0% of the time with kernel 1.3.72.
The modem in question is a US Robotics 14.4. Linux distribution:
Redhat 3.0.3. I use `dip' 3.3.7n to make the CSLIP connection.
Other system info:
/proc/cpuinfo:
processor : 0
cpu : 586
model : Pentium 75+
vendor_id : GenuineIntel
stepping : 5
fdiv_bug : no
hlt_bug : no
fpu : yes
fpu_exception : yes
cpuid : yes
wp : yes
flags : fpu vme de pse tsc msr mce cx8
bogomips: : 39.73
/proc/devices:
Character devices:
1 mem
2 pty
3 ttyp
4 tty
5 cua
6 lp
7 vcs
9 st
14 sound
Block devices:
1 ramdisk
2 fd
3 ide0
8 sd
22 ide1
/proc/dma:
1: SB16 (8bit)
4: cascade
5: SB16 (16bit)
/proc/interrupts:
0: 16547 timer
1: 751 keyboard
2: 0 cascade
3: 828 + serial
5: 0 SoundBlaster
11: 1709 + aic7xxx
13: 1 math error
14: 5 + ide0
15: 0 + ide1
/proc/meminfo:
total: used: free: shared: buffers: cached:
Mem: 31723520 13283328 18440192 7258112 913408 6082560
Swap: 34582528 0 34582528
MemTotal: 30980 kB
MemFree: 18008 kB
MemShared: 7088 kB
Buffers: 892 kB
Cached: 5940 kB
SwapTotal: 33772 kB
SwapFree: 33772 kB
/proc/ioports:
0000-001f : dma1
0020-003f : pic1
0040-005f : timer
0060-006f : kbd
0070-007f : rtc
0080-009f : dma page reg
00a0-00bf : pic2
00c0-00df : dma2
00f0-00ff : npu
0170-0177 : ide1
01f0-01f7 : ide0
0220-022f : SoundBlaster
02f8-02ff : serial(set)
0376-0376 : ide1
0378-037f : lp
0388-038b : OPL3/OPL2
03c0-03df : vga+
03f0-03f5 : floppy
03f6-03f6 : ide0
03f7-03f7 : floppy DIR
03f8-03ff : serial(auto)
1000-1007 : IDE DMA
1008-100f : IDE DMA
2000-20be : aic7xxx
/proc/version:
Linux version 1.3.85 (root@slow-zone) (gcc version 2.7.2) #4 Tue Apr 9 19:27:46 PDT 1996
Kevin Layer layer@Franz.COM http://www.franz.com/
Franz Inc., 1995 University Avenue, Suite 275, Berkeley, CA 94704, USA
Phone: (510) 548-3600 FAX: (510) 548-8253