[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Possible regression: XEN 4.0.0 total_memory decrease
Yes you're correct! Both hosts have dom0_mem=512M set. Xen 3.4.2: free_memory : 3514 Xen 4.0.0: free_memory : 3523 So now it appears to be a free memory INCREASE caused by this 'bug' ? ;) Thank you!!! Keir Fraser wrote: Ah, hm, I think this is a bug in total memory reporting only. I think the memory is still there in the free pools though. :-) How does xm info's free_memory compare in the two cases? I bet it's a lot closer than 150MB (assuming dom0 is allocated the same amount of memory in both cases, e.g., by explicitly specifying dom0_mem=xxx on Xen command line). -- Keir On 15/04/2010 18:33, "Alex Williams" <awilliams@xxxxxxxx> wrote:Hello, Both builds run a 64-bit Xen kernel and 64-bit Dom0 kernel. (XEN) Xen kernel: 64-bit, lsb, compat32 (XEN) Dom0 kernel: 64-bit, lsb, paddr 0xffffffff80200000 -> 0xffffffff805d388c As for the RAM: Xen 3.4.2: (XEN) System RAM: 3946MB (4041012kB) Xen 4.0.0: (XEN) System RAM: 4084MB (4182064kB) I have also verified with only 2048MB installed in the system. Here are the results: Xen 3.4.2: (XEN) System RAM: 2036MB (2084912kB) Xen 4.0.0: (XEN) System RAM: 1898MB (1943860kB) Still 150MB RAM missing... it appears this problem is static and independant of the amount of RAM installed in the system. Regards, Keir Fraser wrote:Are the hypervisor and dom0 kernel 64-bit or 32-bit? Xen prints a message "System RAM: xxx" early during boot. Do these differ significantly for you between 3.4.2 and 4.0.0? K. On 15/04/2010 16:54, "Alex Williams" <awilliams@xxxxxxxx> wrote:Hello, I noticed a significant *decrease* (150MB) in "total_memory" on a host build using XEN 4.0.0 with kernel 2.6.18. Here are the details: Server = 4096MB RAM XEN 3.4.2 + kernel 2.6.18: xm info | grep total_memory = 4084 XEN 4.0.0 + kernel 2.6.18: xm info | grep total_memory = 3946 The exact same kernel config file was used for both builds. I also made sure there is absolutely no difference on the hosts (while the builds are created on a different machine). This seems like a regression, unless someone can provide suggestions on how to correct this? Thanks. -- Alexander Williams IT Architecture Specialist Spécialiste de l'Architecture TI http://www.iWeb.com/ _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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