[dpdk-dev] rte_mbuf structure size in Windows
Tal Shnaiderman
talshn at mellanox.com
Wed May 13 10:55:11 CEST 2020
> Subject: Re: rte_mbuf structure size in Windows
>
> Hi,
>
> This is the issue we were talking about from the beginning of year. Microsoft
> was supposed to track the bug and allocate resources to fix it if possible. On
> the last community call, Naty and Omar claimed there is no noticeable
> performance impact with l2fwd if mbuf spans 3 cache lines, but DmitryM
> commented this may depend on cache utilization.
>
> For GCC, the following workaround exists:
>
> https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%
> 2Fgithub.com%2FPlushBeaver%2Fdpdk%2Fcommit%2F37f052cb18d1d5d4258
> 18196d5e1d15a7ada0de0&data=02%7C01%7Ctalshn%40mellanox.com%
> 7Ca5df987ffdff439a4ea608d7f7189f62%7Ca652971c7d2e4d9ba6a4d149256f46
> 1b%7C0%7C0%7C637249557444653368&sdata=dkaDS7%2FM%2BvOwgx
> RVjfRsGkAO66rGhRCAHUHzybpOxYY%3D&reserved=0
Thank you Dmitry, do we plan to push this WO or stay with 3 cache lines uniformly
on Windows builds until the clang bug is resolved?
(I'm out of the loop regarding this issue).
>
> No workaround for Clang is known, bug URL:
>
> https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%
> 2Fbugs.llvm.org%2Fshow_bug.cgi%3Fid%3D24383&data=02%7C01%7Ct
> alshn%40mellanox.com%7Ca5df987ffdff439a4ea608d7f7189f62%7Ca652971c
> 7d2e4d9ba6a4d149256f461b%7C0%7C0%7C637249557444653368&sdata
> =XJnc7Q%2BTRt%2F2TyPEOl3uO2cXhdCFzArbvreDak65DJw%3D&reserv
> ed=0
>
> --
> Dmitry Kozlyuk
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