A few thoughts on various statements: 1.The Linux development process is a little different than the traditional S390 where we test things ad nauseum before we let them out the door. I apologize that VM Performance hasn't had time to fully measure the swap to dcss. It's on the list, but there are a few more pressing issues right now. But this discussion is good; it helps me think about what to consider in the measurements. 2.A DCSS segment defined as EW will have a lower priority in the VM storage management steal algorithms, unlike traditional segments and vdisks. So it doesn't have the same challenge as vdisk currently does. 3.Swapping to DCSS can be done as a block device which can lower the pathlength (i.e. not having to create CCWs etc.) compared to vdisk swapping. 4.Using recent VM and Linux you can create gaps for the DCSS, but the DCSS is still limited below 2GB. So it won't be an acceptable alternative in all cases. 5.The swapping itself can occur without VM intervention, except for the creation and when required the actual paging of the DCSS (that's VM paging, not Linux).
Bill Bitner - VM Performance Evaluation - IBM Endicott - 607-429-3286 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
