[6116] in linux-scsi channel archive
Re: PROBLEM: PPP stalls when CDROM is active
daemon@ATHENA.MIT.EDU (Eric Youngdale)
Thu Mar 18 06:29:19 1999
Date: Wed, 17 Mar 1999 23:12:04 -0500 (EST)
From: Eric Youngdale <eric@andante.jic.com>
To: Lars Christensen <larsch@cs.auc.dk>
cc: linux-scsi@vger.rutgers.edu, longyear@pobox.com
In-Reply-To: <Pine.GSO.4.03.9903172114260.24361-100000@luke.cs.auc.dk>
My guess (without any other information) is that the problem is
due to lock contention for io_request_lock.
-Eric
"The world was a library, and its books were the stones, leaves,
brooks, grass, and the birds of the earth. We learned to do what only
a student of nature ever learns, and that was to feel beauty."
Chief Luther Standing Bear - Teton Sioux
On Wed, 17 Mar 1999, Lars Christensen wrote:
>
> I have a combined problem with PPP connections and IDE-SCSI emulation -
> here is my problem description:
>
> [1.] PPP stalls when CDROM is active
>
> [2.] I have 2 ATAPI CDROM drives installed in my computer, one 32 speed
> regular drive and one 4 speed Yahama 4001t CDROM Writer. I use SCSI
> emulation for both drives. When I either read (using dd) or write (usinged
> cdrecord) from/to the Yahama CDWriter, my PPP connection to the Internet
> stalls. Any existing connection over the PPP connections stops sending and
> receiving data when I access the CDROM drive. As soon as I stop the CD
> access, the network connection resumes. Everything seems affected
> (udp/tcp).
>
> - There is no such problem when i access my regular CDROM drive
> (reader only).
>
> - The local network does not seem to be affected although I can only check
> the loopback address and my local ethernet address as I'm not connected to
> any network right now.
>
> - No errors occur reading or writing CD's - it simply just blocks the
> network connections.
>
> - The CPU is not exhausted - my rc5 client (can) crack away while burning.
>
> [3.] scsi-modules, (PPP) networking,
>
> [4.] Linux version 2.2.3 (root@charon.s.cs.auc.dk) (gcc version 2.7.2.3)
> #4 SMP sat mar 13 23:01:26 CET 1999
>
> [5.] n/a
>
> [6.] n/a
>
> [7.]
>
> [7.1.] Dump from ver_linux
> Linux charon.s.cs.auc.dk 2.2.3 #4 SMP lør mar 13 23:01:26 CET 1999 i686
> unknown
> Kernel modules 2.1.121
> Gnu C 2.7.2.3
> Binutils 2.9.1.0.15
> Linux C Library 2.0.7
> Dynamic linker ldd (GNU libc) 2.0.7
> Linux C++ Library 2.8.0
> Procps 1.2.9
> Mount 2.8a
> Net-tools (1999-01-01)
> Kbd 0.96
> Sh-utils 1.16
>
> [7.2.] Dump from /prov/cpuinfo
> processor : 0
> vendor_id : GenuineIntel
> cpu family : 6
> model : 5
> model name : Pentium II (Deschutes)
> stepping : 1
> cpu MHz : 348.490383
> cache size : 512 KB
> fdiv_bug : no
> hlt_bug : no
> sep_bug : no
> f00f_bug : no
> fpu : yes
> fpu_exception : yes
> cpuid level : 2
> wp : yes
> flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov
> pat pse36 mmx osfxsr
> bogomips : 347.34
>
> [7.3.] /proc/modules
> nls_iso8859-1 2024 0 (autoclean)
> sr_mod 16944 0 (autoclean)
> cdrom 11600 0 (autoclean) [sr_mod]
> isofs 17100 0 (autoclean)
> ide-scsi 6708 0
> scsi_mod 36916 2 [sr_mod ide-scsi]
> ppp 18456 2 (autoclean)
> slhc 4224 1 (autoclean) [ppp]
> 3c59x 17520 1 (autoclean)
> sound 56636 0 (unused)
> soundcore 2412 3 [sound]
>
> [7.4.] /prov/scsi/scsi
> Attached devices:
> Host: scsi0 Channel: 00 Id: 00 Lun: 00
> Vendor: PIONEER Model: CD-ROM DR-A14S Rev: 1.04
> Type: CD-ROM ANSI SCSI revision: 02
> Host: scsi0 Channel: 00 Id: 01 Lun: 00
> Vendor: YAMAHA Model: CRW4001 Rev: 1.0e
> Type: CD-ROM ANSI SCSI revision: 02
>
> [7.5.] The devices for the drives are /dev/scd0 for the CD reader and
> /dev/scd1 for the CD writer.
>
> /Lars Christensen
> larsch@cs.auc.dk
> http://www.cs.auc.dk/~larsch
>
>
> -
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