Kernel 2.6 based: April 2004 stream

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linux-2.6.5-s390-03-april2004.tar.gz / MD5 ... accumulated patch, recommended (2004-05-28)

linux-2.6.5-s390-03-april2004-patches.tar.gz / MD5 ... per-problem-patches, recommended (2004-05-28)

These patches contain the following linux kernel bug fixes:

Description:

iucv: Connection lost with high network load.

Symptom:

Slow or lost IUCV-connection on systems with several CPUs active.
Sometimes strange message "iucv_send returned 00000026" in dmesg.

Problem:

Race in function grab_param().

Solution:

Re-implementation of function grab_param().

Problem-ID:

-

Description:

qeth: HiperSockets performance loss compared to Linux 2.4.

Symptom:

With certain workloads a performance loss compared to the Linux 2.4 version of qeth may be experienced.

Problem:

Inefficient qdio queue handling for HiperSockets.

Solution:

Optimized qdio queue handling for HiperSockets. Introduced function qeth_do_send_packet_fast as shortcut for HiperSockets. Also added some more performance statistics to improve performance tracking.

Problem-ID:

-

Description:

qeth: osasnmpd not working on Linux 2.6.

Symptom:

osasnmpd does not work with 2.6 version of qeth.

Problem:

snmp functionality not yet implemented on 2.6 qeth.

Solution:

Added missing functions to support snmp.

Problem-ID:

-

Note:

The osasnmpd daemon in s390 tools 1.3.0 is not yet enabled to run with kernel 2.6.

Description:

qeth: problems when querying ARP cache with larger number of entries.

Symptom:

If a device's ARP cache contains a large number of entries, query ARP (qetharp -nq) results in an "unknown error" and fails.

Problem:

User space buffer to receive ARP entries is 20000 bytes and can only hold 454/526 entries (for OSA/HiperSockets).

Solution:

Each entry contains 32 bytes of "media specific information" which is not used. Added an option to strip off these unused bytes before copying to user space. This "STRIP_ENTRIES" option can be set by the qetharp user tool. Now it is possible to receive 1666/3333 entries.

Problem-ID:

-

Description:

z90crypt: requests coming back from card with no caller waiting.

Symptom:

"helper_receive_rc -> rc 15" in log.

Problem:

Failing to schedule reader_task.

Solution:

Schedule reader_task using global count.

Problem-ID:

-

Note:

applicable for 31-bit Linux, possibly for 64-bit Linux (but non-reproducible)

Description:

zfcp: Remove performance statistics code.

Symptom:

Minor performance degradation.

Problem:

The zfcp LLDD contains code that was used to collect performance statistics but is not used anymore.

Solution:

Remove unnecessary/unused code, also remove some unnecessary includes.

Problem-ID:

-

Everybody should apply this patch.

To create the complete linux kernel sources, the following patches need to be applied in sequence:

linux-2.6.5.tar.gz (see www.kernel.org/pub/linux/kernel/v2.6)
+ linux-2.6.5-s390-base-april2004.diff (IBM)
+ linux-2.6.5-s390-01-april2004.diff (IBM)
+ xipfs612 (see linuxvm.org/patches/index.html)
+ xipfs622 (see linuxvm.org/patches/index.html)
+ linux-2.6.5-s390-02-april2004.diff (IBM)
+ linux-2.6.5-s390-03-april2004.diff (IBM)

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