Roger Pau Monné <roger.pau@xxxxxxxxxx> writes: > On 20/05/14 11:54, Vitaly Kuznetsov wrote: >> Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> writes: >> >>> 1) ramdisks (/dev/ram*) (persistent grants and indirect descriptors >>> disabled) >> >> sorry, there was a typo. persistent grants and indirect descriptors are >> enabled with ramdisks, otherwise such testing won't make any sense. > > I'm not sure how is that possible, from your description I get that you > are using 3.11 on the Dom0, which means blkback has support for > persistent grants and indirect descriptors, but the guest is RHEL7, > that's using the 3.10 kernel AFAICT, and this kernel only has persistent > grants implemented. RHEL7 kernel is mostly merged with 3.11 in its Xen part, we have indirect descriptors backported. Actually I tried my tests with upstream (Fedora) kernel and results were similar. I can try comparing e.g. 3.11.10 with 3.12.0 and provide exact measurements. -- Vitaly -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html