From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: "Roger Pau Monné" <roger.pau@citrix.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
axboe@kernel.dk, felipe.franciosi@citrix.com,
gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org,
stable@vger.kernel.org, jerry.snitselaar@oracle.com,
xen-devel@lists.xenproject.org
Subject: Re: [Xen-devel] Backport request to stable of two performance related fixes for xen-blkfront (3.13 fixes to earlier trees)
Date: Tue, 20 May 2014 13:41:10 +0200 [thread overview]
Message-ID: <87lhtwznhl.fsf@vitty.brq.redhat.com> (raw)
In-Reply-To: <537B2F2C.4080905@citrix.com> ("Roger Pau \=\?utf-8\?Q\?Monn\?\= \=\?utf-8\?Q\?\=C3\=A9\=22's\?\= message of "Tue, 20 May 2014 12:32:12 +0200")
Roger Pau Monné <roger.pau@citrix.com> writes:
> On 20/05/14 11:54, Vitaly Kuznetsov wrote:
>> Vitaly Kuznetsov <vkuznets@redhat.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
next prev parent reply other threads:[~2014-05-20 11:41 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-14 19:11 Backport request to stable of two performance related fixes for xen-blkfront (3.13 fixes to earlier trees) Konrad Rzeszutek Wilk
2014-05-14 19:21 ` Josh Boyer
2014-05-20 3:19 ` Greg KH
2014-05-22 12:54 ` Roger Pau Monné
2014-05-20 9:32 ` [Xen-devel] " Vitaly Kuznetsov
2014-05-20 9:54 ` Vitaly Kuznetsov
2014-05-20 10:32 ` Roger Pau Monné
2014-05-20 11:41 ` Vitaly Kuznetsov [this message]
2014-05-20 13:59 ` Felipe Franciosi
2014-05-22 8:52 ` Vitaly Kuznetsov
2014-06-04 5:48 ` Greg KH
2014-06-06 10:47 ` Jiri Slaby
2014-06-06 10:58 ` Vitaly Kuznetsov
2014-06-10 13:19 ` [Xen-devel] " Vitaly Kuznetsov
2014-06-10 16:55 ` Roger Pau Monné
2014-06-12 12:00 ` Vitaly Kuznetsov
2014-06-12 12:32 ` Felipe Franciosi
2014-06-12 15:32 ` Vitaly Kuznetsov
2014-06-20 17:06 ` Felipe Franciosi
2014-06-10 17:26 ` Felipe Franciosi
2014-06-06 13:56 ` Greg KH
2014-06-06 14:02 ` Konrad Rzeszutek Wilk
2014-06-06 14:03 ` Jiri Slaby
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