Gentoo Linux // PowerEdge 6400/700 4-CPU 6GB Memory

Robert_Uzzi@Dell.com Robert_Uzzi at Dell.com
Thu Jun 19 10:57:01 CDT 2003


Gentoo is nice I use it at home. It's starting to make inroads into the
enterprise level. I'll wait to hear from the kernel experts about your
memory question but I've used the tmpfs a bit so I'll comment about that.
Think of tmpfs as a dynamically expandable and shrinkable ramdrive. Write 1
meg of data to /dev/shm and it will use 1 meg of ram, delete it and the ram
used is released.

-----Original Message-----
From: Tim Schaefer [mailto:tschaefer at dwcsolutions.com] 
Sent: Thursday, June 19, 2003 10:16 AM
To: linux-poweredge at dell.com
Subject: Gentoo Linux // PowerEdge 6400/700 4-CPU 6GB Memory


Hi all,
 
We've had great success with Gentoo Linux on our PowerEdge 6400.  Things
have been running very
smooth, no major gotchas, and this week we even have an EMC Emulex drive
hooked up from our SAN. 
I downloaded the drivers from Emulex, compiled them as modules, did the
insmod thang, and we now
have EMC connected.  I love it.
 
I continue to be amazed at how well this beast is performing. It has
performed better than one of our
newer Unisys ES7000's ( the Windows DataCenter UNIX-killer ) as a Linux box,
and is continuing to 
generate excitement in our company.  
 
But now we're running into "out of memory" problems:
 
dmesg:
 
Out of Memory: Killed process 1630 (unitool).
 
Unitool is an ETL program that spawns multiple processes for data
transformation.  ( www.abinitio.com <http://www.abinitio.com>  )
 
I do have several questions that I can't seem to find answers for:
 
1.  We have 6 GB of memory, and have PAE enabled in the kernel ( High-Memory
Support ). I do see
     a large amount of memory a little over 5GB being cached to disk during
the ETL processing.  Is this
     normal?  How can we use the PAE memory?  Is this something that the
software will have to be
     enabled for?
 
Linux kaadu.weclick.com 2.4.20 #26 SMP Tue May 13 16:44:58 UTC 2003 i686
Pentium III (Cascades) GenuineIntel GNU/Linux
 
kaadu root # dmesg
 
5248MB HIGHMEM available.
896MB LOWMEM available.
found SMP MP-table at 000fe710
hm, page 000fe000 reserved twice.
hm, page 000ff000 reserved twice.
hm, page 000f0000 reserved twice.
On node 0 totalpages: 1572864
zone(0): 4096 pages.
zone(1): 225280 pages.
zone(2): 1343488 pages.
Intel MultiProcessor Specification v1.4
    Virtual Wire compatibility mode.
OEM ID: DELL     Product ID: POWEREDGE 9C APIC at: 0xFEE00000
Processor #3 Pentium(tm) Pro APIC version 17
Processor #0 Pentium(tm) Pro APIC version 17
Processor #1 Pentium(tm) Pro APIC version 17
Processor #2 Pentium(tm) Pro APIC version 17
I/O APIC #4 Version 17 at 0xFEC00000.
I/O APIC #5 Version 17 at 0xFEC01000.
Processors: 4
Kernel command line: auto BOOT_IMAGE=2.4.20 ro root=803

 
kaadu root # cat /proc/meminfo
        total:    used:    free:  shared: buffers:  cached:
Mem:  6227025920 6180974592 46051328        0 62799872 5684076544
Swap:        0        0        0
MemTotal:      6081080 kB
MemFree:         44972 kB
MemShared:           0 kB
Buffers:         61328 kB
Cached:        5550856 kB
SwapCached:          0 kB
Active:         544508 kB
Inactive:      5205900 kB
HighTotal:     5242872 kB
HighFree:         2044 kB
LowTotal:       838208 kB
LowFree:         42928 kB
SwapTotal:           0 kB
SwapFree:            0 kB

 
2.  How do I take advantage of tmpfs?  is this just shared memory?  Here are
our mounts:
 
kaadu root # df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda3              16G  4.6G   11G  31% /
tmpfs                 2.0M   20K  2.0M   1% /mnt/.init.d
tmpfs                 2.9G     0  2.9G   0% /dev/shm
/dev/sdb1             319G  127G  176G  42% /data
/dev/sdd1             241G   15G  214G   7% /data2

/data   is a local SCSI drive
/data2 is the EMC drive
 
I think I compiled the kernel to put swap in memory, but gasp can't remember
what the option was to do that--it apears to be working.  <:-)
 
If there is more info needed please let me know, I'll post it.
 
Thanks in advance if you can help... We love this box on Linux, it rocks!
 
Tim
 
Tim Schaefer
Project Manager, Data Base Administration
Data Warehouse Corporation, Boca Raton, FL
1-561-237-0082    1-888-707-7600 ext. 223
tschaefer at dwcsolutions.com <mailto:tschaefer at dwcsolutions.com> 
www.dwcsolutions.com <http://www.dwcsolutions.com> 

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