[Lustre-discuss] Facing issues in applying zero copy patch on rhel6.

aayush agrawal aayush.agrawal at calsoftinc.com
Mon Apr 7 04:20:01 PDT 2014


I got both the errors resolved. Looks like there was some issue with my 
lustre build process itself.
So I think along with raid5-zerocopy-rhel6.patch, 
raid5-stats-rhel6.patch was the only additional patch required.


On 3/24/2014 8:40 PM, aayush agrawal wrote:
> Hi,
> I wanted to apply zero copy patch on rhel6 so I followed below steps:
>  1. Downloaded lustre-2.1.2 and corresponding kernel
>     rpm(linux-2.6.32-220.17.1.el6). The OS I am using is CentOS 6.4.
>  2. Applied kernel patches from lustre source code to kernel.
>  3. Downloaded a zero copy patch for rhel6 from:
>     https://github.com/Xyratex/lustre-stable/blob/b_neo_1.4.0/lustre/kernel_patches/patches/raid5-zerocopy-rhel6.patch
>  4. Applied this patch to above kernel.
>  5. Then I tried to compile this kernel but it gives undefined symbol
>     errors for writes_zcopy and PageConstant.
>      1. For writes_zcopy I found another patch on the same git hub
>         link:
>         https://github.com/Xyratex/lustre-stable/blob/b_neo_1.4.0/lustre/kernel_patches/patches/raid5-stats-rhel6.patch.
>      2. For PageConstant I couldn't find any patch to rectify this
>         error. Even I do not see usage of PG_Constant/SetPageConstant
>         etc. in raid5-zerocopy-rhel6.patch which I think is essential.
>  6. So my questions are:
>      1. I think few patches are missing here. As mentioned above one
>         of them would be raid5-stats-rhel6.patch please confirm.
>      2. if confirmed, still there has to be at least one patch missing
>         (to include PageConstant use). Are there any other patches to
>         be applied before I apply raid5-stats-rhel6.patch and
>         raid5-zerocopy-rhel6.patch.
>      3. I am seeing that this zero copy patch existed in lustre-2.1.2,
>         In lustre/kernel-patches/patches directory for rhel5. But it
>         has been removed in latest lustre 2.5.0. Is there any specific
>         reason to remove it.
> Thanks,
> Aayush

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