Nick Couchman
2011-Mar-18 19:50 UTC
[Xen-users] Issues with PCI Passthrough and domU Memory Amount
Hey, Everyone, I know I''ve asked about this, before, but I''m hoping that someone has some new insight into this problem. I''m using Xen 4.0.0 and 4.0.1 on Dell Optiplex 780 machines. I''m running Xen with an OpenSuSE 11.2/11.3/11.4 install, a Windows domU, and am passing through graphics, USB, and audio PCI devices from the host machine to the Windows domU. In general, this works pretty well, but I''ve hit upon an issue that seems pretty consistent across the versions of Xen and Linux dom0s. Basically, the more I increase the amount of RAM assigned to the Windows domU, the longer the domU takes to start (not the O/S to boot, just Xen to get the domU running and dom0 to hand over all the resources). So, with 2GB of RAM assigned to the domU, it starts reasonably quickly and proceeds to boot Windows. With 2.5GB, the boot time is longer, but still short enough to actually get it going (takes 2-3 minutes between executing the "xm start <domu>" command and when I see the domU BIOS screen). Once I hit 3GB, it takes so long between the start command when the domU can actually get going, that one of the Xen timeouts is reached and Xen fails to start the domU. Anyone have any insight into this? Log files don''t seem to indicate a lot - in fact, the qemu-dm log files spit out exactly the same thing for the successful start and the unsuccessful start. I''d appreciate any ideas to try to reduce the amount of time or to at least figure out why it takes Xen and/or dom0 so long to get these domUs up and running. Thanks, Nick -------- This e-mail may contain confidential and privileged material for the sole use of the intended recipient. If this email is not intended for you, or you are not responsible for the delivery of this message to the intended recipient, please note that this message may contain SEAKR Engineering (SEAKR) Privileged/Proprietary Information. In such a case, you are strictly prohibited from downloading, photocopying, distributing or otherwise using this message, its contents or attachments in any way. If you have received this message in error, please notify us immediately by replying to this e-mail and delete the message from your mailbox. Information contained in this message that does not relate to the business of SEAKR is neither endorsed by nor attributable to SEAKR. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users