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Hi,<br>
<br>
I wanted to apply zero copy patch on rhel6 so I followed below
steps:<br>
<br>
<ol>
<li>Downloaded <font face="Times New Roman, serif"><font size="3">lustre-2.1.2
and corresponding kernel rpm</font></font><font face="Times
New Roman, serif"><font size="3">(linux-2.6.32-220.17.1.el6</font></font>).
The OS I am using is CentOS 6.4.</li>
<li>Applied kernel patches from lustre source code to kernel.</li>
<li>Downloaded a zero copy patch for rhel6 from:
<a class="moz-txt-link-freetext" href="https://github.com/Xyratex/lustre-stable/blob/b_neo_1.4.0/lustre/kernel_patches/patches/raid5-zerocopy-rhel6.patch">https://github.com/Xyratex/lustre-stable/blob/b_neo_1.4.0/lustre/kernel_patches/patches/raid5-zerocopy-rhel6.patch</a></li>
<li>Applied this patch to above kernel.</li>
<li><font face="Times New Roman, serif"><font size="3">Then I
tried to compile this kernel </font></font> but it gives
undefined symbol errors for writes_zcopy and PageConstant.</li>
<ol>
<li>For writes_zcopy I found another patch on the same git hub
link:
<a class="moz-txt-link-freetext" href="https://github.com/Xyratex/lustre-stable/blob/b_neo_1.4.0/lustre/kernel_patches/patches/raid5-stats-rhel6.patch">https://github.com/Xyratex/lustre-stable/blob/b_neo_1.4.0/lustre/kernel_patches/patches/raid5-stats-rhel6.patch</a>.</li>
<li>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.
<br>
</li>
</ol>
<li>So my questions are:</li>
<ol>
<li>I think few patches are missing here. As mentioned above one
of them would be raid5-stats-rhel6.patch please confirm.</li>
<li>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.</li>
<li>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.</li>
</ol>
</ol>
<p>Thanks,<br>
Aayush<br>
</p>
<br>
<br>
<br>
<br>
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