Jumbo Frames on Virtual Ethernet Interfaces
Date Posted: February 01, 2008 04:44 PM
Author: Mel Beckman
Dear Doctor, Our System i includes a couple of Linux LPAR partitions that we use to collect data from other systems; the data is then manipulated nightly in a very I/O intensive process. I discovered that I could speed the nightly process by a factor of four by simply changing the default Ethernet frame size of the virtual LAN interfaces from 1,500 to 9,000 bytes (so-called "jumbo" frames). Even though our System i has 100BaseT physical interfaces, I figured inter-Linux traffic won't use those, so I went for the maximum frame size. All went well the first night, but the next day users complained that the Linux applications had very slow network performance. I discovered that switching the frame size back to 1,500 bytes restored daytime performance, but now nighttime processing is slow again. Can't I have my cake and eat it too?

Related Content:


 
There are no comments to display. Be the first to add your thoughts!
You must log on before posting a comment.

Are you a new visitor? Register Here
 

around the forums

better data access for AS400 applications
Forum Name: Systems Management
21 May 2012 06:22 AM | Replies: 3
Selection error involving field *N.
Forum Name: SQL, Query and Database
18 May 2012 02:19 PM | Replies: 6
WINDOWS 7 with CLIENT ACCESS 7 R1
Forum Name: Communications/Networking
18 May 2012 08:43 AM | Replies: 1
subscribe to this feed

ProVIP Sponsors

BCD

Join Our Community!

Subscribe today to iPro Developer! iPro Developer is packed with technical know-how for developers of IBM i, iSeries, AS400 and System i. Sign up now to get your full subscriber benefits including:

  • Code available for download
  • Full access to the online article archive (including all System iNEWS ProVIP content)
  • Downloadable ebook with past 6 months of articles
  • Discounts on eLearning classes, self-paced training, in-person events, and more!
iPro Developer Newsletters
  • Get the Latest News
  • Product Updates
  • Helpful Tricks
  • Productivity Tips