[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] FreeBSD/Xen ugliness
I've seen the same timing issues. We do call yield where appropriate: static void cpu_idle_default(void) { #if 0 /* * we must absolutely guarentee that hlt is the * absolute next instruction after sti or we * introduce a timing window. */ __asm __volatile("sti; hlt"); #endif enable_intr(); HYPERVISOR_yield(); } So I'm not sure what the problem is. After the 5.3 work and coredump is done I might look into it. There may have been some fixes to the clock code in the meantime. -Kip On Sat, 8 Jan 2005, Derrik Pates wrote: > Kip: > > Well, I have good news; thanks to Darren Tucker pointing out that the > boot.netif.* parameters _have_ to be added, I was able to successfully > boot your FreeBSD/Xen kernel. It seems to work okay so far. It fairly > regularly (every few minutes or so) spits out a line like: > > Expensive timeout(9) function: 0xc00b0bd0(0) 0.010000854 s > > at me, but it seems to otherwise behave as FreeBSD should. The only > thing I've noticed so far is that, looking at the output of 'xm list', > its domain's virtual-time clock seems to grow at a constant rate. I'm > guessing this means it doesn't call up to the hypervisor and say "Please > schedule someone else, I'm idle right now" when it has nothing to do. It > doesn't seem to affect the performance of other domains though, but I > thought it worth pointing out. Unfortunately, I don't know enough about > FreeBSD's scheduler to make the necessary changes to make this work as > it should. I'll have to see about getting a proper full CVS pull of the > sys/ tree for 5.2.1 on my FreeBSD install in VMware, and see if I can > make a FreeBSD kernel build work; however, I'd like to see the 5.3 > kernel when you get around to it. > > -- > Derrik Pates > dpates@xxxxxxxxxx > ------------------------------------------------------- The SF.Net email is sponsored by: Beat the post-holiday blues Get a FREE limited edition SourceForge.net t-shirt from ThinkGeek. It's fun and FREE -- well, almost....http://www.thinkgeek.com/sfshirt _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/xen-devel
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