On Monday 13 December 2004 16:46, Hegedus Gabor wrote: > Hi! > > I'm running 12 UML-s with nice level 1 (first 15). Inside the uml-s the > reaction time for a disk io is poor. Eg if I make apt-get install wget > it is about 5 minutes.
> It is a RAID5 array, with adaptec 2120S scsi raid controller, 3 > (10000rpm) disk-s in the raid array. > The host system is responding enough fast. But inside the uml-s it is > slow. Guess you should disable Synchronous UBD in the kernel config and replace on the UML command line ubd#=... with ubd#s=.... that makes each UBD synchronous again, but in a different, faster way, with no safety loss... (in recent UML kernels this bad "Synchronous UBD" behaviour has been disabled). The performance hit was due to the fact that the whole UML kernel (including all the processes) paused while waiting for the host I/O result, while in the "fast" configuration described it's done by a separate thread, thus allowing execution of other work during the disk I/O. Search for "bonnie++" and "killing" together on the archives and you should find this. Btw - what's your UML version?(you forgot exactly this) > I'm using kernel (vanillia kernel patched with: > host-skas3-2.4.25-v3.patch) Correct. -- Paolo Giarrusso, aka Blaisorblade Linux registered user n. 292729 http://www.user-mode-linux.org/~blaisorblade ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://productguide.itmanagersjournal.com/ _______________________________________________ User-mode-linux-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
