DaemonForums  

Go Back   DaemonForums > Miscellaneous > Off-Topic

Off-Topic Everything else.

 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
  #1   (View Single Post)  
Old 9th May 2011
vermaden's Avatar
vermaden vermaden is offline
Administrator
 
Join Date: Apr 2008
Location: pl_PL.lodz
Posts: 1,051
Thanked 118 Times in 93 Posts
Cool HOWTONOT: upgrade memory

I add this little 'story' here as a warning, that may be helpful for performance troubleshooting.

Some time ago I bought used MINI ITX motherboard with Intel T8100 CPU and 965GM chipset, it came along with used 2 x 512MB RAM 667MHz DDR2. I already had 2 x 2GB RAM 800Mhz DDR2 from my older box, so the first thing I did after assembling all the parts was upgrade the amount of RAM.

The system worked well, 50+ days of uptime until power loss from time to time, it has ZFS mirror on 2 x 2TB drives. But I 'found' some strange performance problems.

So I started to look for the cause of the problem.

First I thought its slow because I have 80% filled ZFS, but after upgrade to 8.2-STABLE and various performance improvements it should not be a problem.

Then I thought that CPU may be overheating ... but it wasnt.

My 2TB disks are LOW POWER Seagate's so I thought that maybe their random access time is so low that its because of that, nope.

I also thought that it may be because of maybe broken 8GB CompactFlash card that is used for hte base system, nope.

At that point I did not had any clues what to check more.

But I thought, maybe I will also check memory ...

I found some nice simple memory allocation benchmark called ebizzy (nor in ports) and run # ebizzy -s 4096 to check the speed, compared with memory allocation speed on somparable laptop ... and VIOLA! Thats the problem.

I have just 'degraded' memory from 4GB 800MHz to 1GB 667Mhz and now allocations in ebizzy raised from 11462 records/s into whooping 2347823 recors/s

Also ffmpeg performance improved from 0.2 FPS into ... 40 FPS

Its because 965GM chipset maximum frequency is 667 MHz.

You have been warned ]:->
__________________
religions, worst damnation of mankind
"If 386BSD had been available when I started on Linux, Linux would probably never had happened." Linus Torvalds

Linux is not UNIX! Face it! It is not an insult. It is fact: GNU is a recursive acronym for “GNU's Not UNIX”.
vermaden's: links resources deviantart spreadbsd
Reply With Quote
 

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Memory limit jaax NetBSD General 2 19th February 2011 11:21 AM
free memory werwer OpenBSD General 12 8th July 2010 09:46 PM
KDE4 uses a lot of memory... mdh FreeBSD General 6 21st October 2008 06:21 AM
dwindling memory chavez243 FreeBSD General 15 26th August 2008 04:06 PM
Memory cache graudeejs FreeBSD General 3 9th July 2008 03:27 AM


All times are GMT. The time now is 09:39 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content copyright © 2007-2010, the authors
Daemon image copyright ©1988, Marshall Kirk McKusick