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IBM Lotus Notes, Domino, Domino Designer 8 Release Notes

Kernel values modified by Domino

In addition to the above, other Linux kernel value changes are needed for large scale Domino

environments. Unlike the per-process filehandle limit, which must be modified before logon of the Domino

user id, these values can be modified by Domino itself. At startup, a program named "tunekrnl" runs with

root authority and sets these values in the /proc filesystem. Once set, these /proc values will not change

until Linux is (re)booted, at which time they revert to their default values. The exception to this is

"mapped

base", which is a process-local setting made at each Domino startup. The "tunekrnl" log of

/proc filesystem changes tends to vary from many (following a Linux boot) to few (subsequent Domino

startups). The kernel values modified by "tunekrnl" are:

kernel parameter

default value tunekrnl value description

/proc/sys/fs/file-max (as low as 8192) 131072 maximum number of

system-wide file descriptors

/proc/sys/kernel/sem 250 32000 32 128 250 256000 32

1024

shared semaphore allocation

sizes and limits

/proc/sys/kernel/shmmax 32 M 256 M maximum shared-memory

segment size

/proc/sys/net/ipv4/tcp

fin

timeout 60 15 retransmission timer for a FIN

(socket close) in seconds

/proc/sys/net/ipv4/tcp

max

syn

backlog 1024 16384 maximum value of the listen()

connection backlog

/proc/sys/net/ipv4/tcp

reuse 0 1 1 enables "time-wait

assassination" allowing for

rapid re-use of sockets

/proc/sys/net/ipv4/ip

local

port

range 32768 61000 1024 65535 increases the range of port

values available for connect()

/proc/<pid>/mapped

base 1 Gigabyte 16 Megabytes "floor" address value above

which memory allocations may

occur on SLES

Swap configuration for Linux for System z

SLES8 (31-bit) supports up to 2 Gigabytes of memory; a Domino server supporting thousands of users

will typically require more than 2 Gigabytes of memory, causing swapping to occur in this environment. At

least 1 Gigabyte should be allocated as a swap "disk", however actually swapping to disk (DASD) hinders

performance. One mechanism to keep swapping within system memory is XPRAM. The following

general steps are an example of the configuration of 1 Gigabyte of XPRAM for Linux for System z in a

native environment:

Configure at least 1 gigabyte extended memory from the hardware console. Linux for System z will

automatically detect that.

Configure the xpram driver.

The following Linux commands set swap space 1G from a 3G partition that was made into a file

system and mounted off of the xpram

fs directory:

insmod xpram devs=1 sizes=2000000

mkswap /dev/slram0

swapon /dev/slram

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