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Date: Tue, 20 May 2014 13:41:10 +0200 From: Vitaly Kuznetsov <vkuznets@...hat.com> To: Roger Pau Monné <roger.pau@...rix.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>, axboe@...nel.dk, felipe.franciosi@...rix.com, gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org, stable@...r.kernel.org, jerry.snitselaar@...cle.com, xen-devel@...ts.xenproject.org Subject: Re: [Xen-devel] Backport request to stable of two performance related fixes for xen-blkfront (3.13 fixes to earlier trees) Roger Pau Monné <roger.pau@...rix.com> writes: > On 20/05/14 11:54, Vitaly Kuznetsov wrote: >> Vitaly Kuznetsov <vkuznets@...hat.com> 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 linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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