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From: Shijith Thotton <sthotton@marvell.com>
To: Stephen Hemminger <stephen@networkplumber.org>
CC: "dev@dpdk.org" <dev@dpdk.org>, "Honnappa.Nagarahalli@arm.com"
 <Honnappa.Nagarahalli@arm.com>, "bruce.richardson@intel.com"
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Subject: RE: [EXT] Re: [PATCH v5 5/7] lib: move mbuf next pointer to first
 cache line
Thread-Topic: [EXT] Re: [PATCH v5 5/7] lib: move mbuf next pointer to first
 cache line
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Date: Fri, 7 Oct 2022 21:30:11 +0000
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Errors-To: dev-bounces@dpdk.org

>> Swapped position of mbuf next pointer and second dynamic field (dynfield=
2)
>> if the build is configured to disable IOVA as PA. This is to move the
>> mbuf next pointer to first cache line.
>>
>> Signed-off-by: Shijith Thotton <sthotton@marvell.com>
>> Acked-by: Olivier Matz <olivier.matz@6wind.com>
>
>Why not always move it?
>Having things on different cache lines based on config options
>could cause surprising performance impacts.

Some drivers are using the offset of buf_iova.