David S. Ahern wrote: > Avi Kivity wrote: > >> David S. Ahern wrote: >> >>> Another tidbit for you guys as I make my way through various >>> permutations: >>> I installed the RHEL3 hugemem kernel and the guest behavior is *much* >>> better. >>> System time still has some regular hiccups that are higher than xen >>> and esx >>> (e.g., 1 minute samples out of 5 show system time between 10 and 15%), >>> but >>> overall guest behavior is good with the hugemem kernel. >>> >>> >>> >> Wait, the amount of info here is overwhelming. Let's stick with the >> current kernel (32-bit, HIGHMEM4G, right?) >> >> Did you get any traces with bypass_guest_pf=0? That may show more info. >> >> > > My preference is to stick with the "standard", 32-bit RHEL3 kernel in the > guest. >
Me too. I would like to see all reasonable guests supported well, without performance issues, and not have to tell the use which kernel to use. > My point in the last email was that the hugemem kernel shows a remarkable > difference (it uses 3-levels of page tables right?). I was hoping that would > ring a bell with someone. > From the traces I saw I think the standard kernel is pae as well. Can you verify? I think it's CONFIG_HIGHMEM4G (instead of CONFIG_HIGHMEM64G) but that option may be different for such an old kernel. > Adding bypass_guest_pf=0 did not improve the situation. Did you want anything > particular with that setting -- like a RIP summary or a summary of exit-entry > cycles? > I asked fo this thinking bypass_guest_pf may help show more information. But thinking a bit more, it will not. I think I do know what the problem is. I will try it out. Is there a free clone (like centos) available somewhere? -- Any sufficiently difficult bug is indistinguishable from a feature. ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
