Re: [uml-user] UML I/O performance

[Christopher S. A. <ca...@th...>]

Run skas mode on the host - if you can't compile a new host kernel for some
reason, check into the skas-module one of the contributors on this list submitted
(sorry, don't have a link).

Also, I believe the max file descriptors issue will go away with skas mode, since
there are only 2 processes on the host per UML, instead of the 1 to 1 with tt
mode.

Use tmpfs as your /tmp/ volume,.OR mount a tmpfs dir some place and prepend
"export TMPDIR=/where/you/mounted/tmpfs/" to your ./linux command line.

Also, what is the filesystem type on both the host and inside the UMLs?  If you
are running ext3 any place, you might need to tweak /proc/sys/vm/bdflush.  Check
out the "update" command in RedHat.

These suggestions might not solve your I/O problem, but they are the general
practice for getting UML to run efficiently all around.

-Chris