Just as Bill suggested, you are showing the Linux guest in E3 (eligible
queue). You will want to change your SRM STORBUF (and possibly LDUBUF
settings). A performance monitor like ESAMON will be able to assist you in
arriving at correct values for these settings, but just to get you going I'd
suggest (and these are almost, but not quite, random values):
SET SRM STORBUF 250 225 200
SET SRM LDUBUF 175 150 125
I think a 2G virtual machine in a 2G IFL is asking for trouble. I'd start at
512MB and see what works best (with the appropriate SRM values that will
allow you to overcommit storage). You may also like to carve out some XSTORE
which VM can use as a part of its paging hierachy (256MB or 512MB?). If you
are using SLES8 I'd suggest turning on the timer patch: sysctl -w
kernel.hz_timer=1, but with only 2 guests this may not have much effect.
Neale
Here's an explanation of the SRM settings:
The SET SRM STORBUF command partitions the commitment of real storage (in
terms of pages) based on the transaction class (E1, E2, or E3) of a user.
Basically, SET SRM STORBUF lets you under- or over- commit real storage. The
SET SRM STORBUF command works in much the same way as the SET SRM LDUBUF
command. Note, however, that SET SRM STORBUF partitions the use of real
storage, while SET SRM LDUBUF partitions the use of paging resources (in
terms of access). The exact settings of the SET SRM STORBUF command are
generally more critical than the settings of the SET SRM LDUBUF command and
should be given more attention. Incorrect settings can result in thrashing.
The DSPBUF SRM setting should also be examined if long running tasks are
taking too long because the virtual machine is being placed in the eligible
list for relatively long periods of time. Similarly, the LDUBUF setting
should be examined if the system is not paging very much but there are a
large number of loading users.
-----Original Message-----
At 10:59 AM 2/11/2004, Ferguson, Neale wrote:
>How big is the machine (real and virtual)?
I have 2 gig allocated to the IFL. In my USER DIRECT I have 2 gig
allocated to this image. WCBE requires 1 gig and my e folks stated that 2
would be best.
>What are your SRM settings (Q
>SRM)?
q srm
IABIAS : INTENSITY=90%; DURATION=2
LDUBUF : Q1=100% Q2=75% Q3=60%
STORBUF: Q1=125% Q2=105% Q3=95%
DSPBUF : Q1=32767 Q2=32767 Q3=32767
DISPATCHING MINOR TIMESLICE = 5 MS
MAXWSS : LIMIT=9999%
...... : PAGES=999999
XSTORE : 0%
> What does IND Q
ind q
TCPIP Q0 PS 00000801/00000253 MAINT Q1 R00
00001241/00000600
LINUX3 Q3 PS 00418246/00492551 LINUX2 E3 PS
00018128/00021725
