Custom Query (16363 matches)
Results (1516 - 1518 of 16363)
| Ticket | Resolution | Summary | Owner | Reporter |
|---|---|---|---|---|
| #6045 | fixed | Double caching degrades performance | ||
| Description |
VirtualBox does not appear to be setting the F_NOCACHE fcntl() on virtual disk images. This means that every read by the guest results in memory used in the disk cache in the host. The guest OS is also caching the read data in its disk cache, so counting the copy given to the userspace program, you are using 12KB of RAM for each 4KB disk read. This makes resource allocation hard (a guest given 512MB of RAM on the host may also use another 512MB of kernel RAM for disk caching), gives no performance gain for the guest (because the guest is caching the disk access anyway, and there are very few occasions when the VM's cache is missed but the host OS's cache is hit), and seriously degrades performance of other apps by causing them to be swapped out in preference to pages mapped from the guest's disk image, which are not being accessed. |
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| #6975 | obsolete | AVG Firewall disabled after install of oracle 3.2.4. | ||
| Description |
AVG 9 was running and updated. As soon as the upgrade compleeted, AVG could not re-enable the firewall. windows firewal did enable but I prefer AVG fw. Still cannot enable. |
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| #4671 | fixed | Ubuntu + Seamless crashes | ||
| Description |
Virtual Box handles Seamless desktop has a lot of problems on Windows 7 RTM x64 as host. If I try Ubuntu x64 Explorer crashes on right clicking icons and desktop icons can not be dragged and if I try x86 and i play a movie in KmPLayer with Wm9 overlay i get a continuous flickering on the vm that i cannot get rid of. I use nested paging and amd-v on both machines. |
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