Re: [ilugd] Xen: Dom0 vs guest disk buffer/cache

2010-11-30 Thread Karanbir Singh
On 11/29/2010 11:13 AM, Sirtaj Singh Kang wrote: I am configuring a Xen host with 4-5 guest VMs and have a question about allocation of memory for buffer and cache. As I understand it, all guest disk IO is routed through dom0 first. Does this mean that dom0 buffer/cache is used for guest I/O as

Re: [ilugd] Xen: Dom0 vs guest disk buffer/cache

2010-11-30 Thread Sirtaj Singh Kang
On Wednesday, December 01, 2010, Karanbir Singh wrote: [snip] However, if its blockdev - domU (eg. a logical vol, or a physical disk ) you wont get any filesystem level caching on the host, but there might still be an opportunity to run with seriously high device buffers ( if you so desire and

[ilugd] Xen: Dom0 vs guest disk buffer/cache

2010-11-29 Thread Sirtaj Singh Kang
Hi all, I am configuring a Xen host with 4-5 guest VMs and have a question about allocation of memory for buffer and cache. As I understand it, all guest disk IO is routed through dom0 first. Does this mean that dom0 buffer/cache is used for guest I/O as well, and guest buffer/cache is