topic Re: kernel parameter in Operating System - HP-UX

kernel parameter

john_463 — Fri, 30 May 2003 03:36:30 GMT

Hi to all

I'm creating a mail server on an L class with hpux 11i and sendmail.
It will be access fron 1000-1500 users, which kernel parameter are better increase/decrease for the best performance?
where I can find same information about this question?

tnx

Re: kernel parameter

Michael Tully — Fri, 30 May 2003 03:56:09 GMT

The parameters that could cause you problems are maxusers and maxuprc. You probably don't need as much 'shmmax' but this is a guide only.

Below is from one our servers, that runs many users. Also be careful of the 'dbc_max_pct' parameter. Make sure that it is in the range of 300-500Mb or your total RAM. Also check out this link:
http://docs.hp.com/cgi-bin/otsearch/getfile?id=/hpux/onlinedocs/939/KCParms/KCparams.OverviewAll.html&searchterms=parameters%7ckernel&queryid=20030529-225516

* Tunable Parameters

STRMSGSZ 65535
dump lvol
dbc_max_pct 5
dbc_min_pct 1
eqmemsize 30
ksi_alloc_max 16544
maxdsiz 161021952
maxfiles 100
maxssiz 16777216
maxswapchunks 8192
maxtsiz 134217728
maxuprc 1024
maxusers 1024
msgmax 32768
msgmnb 32768
msgmni 1024
msgseg 32766
msgssz 32
msgtql 4096
maxvgs 30
ncallout 2084
nclist 4196
ncsize 3796
nfile 12500
nflocks 400
ninode 7500
nkthread 3635
nproc 6500
nstrtel 1024
npty 1024
nstrpty 1024
semmap 15002
semmni 8192
semmns 16384
semmnu 4096
semume 128
semvmx 65535
shmmax 10200547328
shmmni 1024
shmseg 1024
st_ats_enabled 0

Regards
Michael

"When I have trouble spelling, it's called fat finger syndrome"

Re: kernel parameter

Steven E. Protter — Fri, 30 May 2003 04:06:35 GMT

Other performance considerations.

Document Link.

Performance Doc
http://www1.itrc.hp.com/service/cki/search.do?category=c0&docType=Security&docType=Patch&docType=EngineerNotes&docType=BugReports&docType=Hardware&docType=ReferenceMaterials&docType=ThirdParty&searchString=UPERFKBAN00000726&mode=id&admit=-682735245+1053636168960+28353475&searchCrit=allwords&printable=true

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