https://jira.whamcloud.com This file is an XML representation of an issue en-us 9.4.14 940014 05-12-2023 https://jira.whamcloud.com/browse/LU-10300 Lustre <p>We test Lustre in the kernel 4.11.0 which use 64K memory page, and we found that there are no config items in the configure.</p> Redhat LU-10300

Can the Lustre 2.10.x clients support 64K kernel page?

Question/Request Major Resolved Cannot Reproduce James A Simmons ZhangWei Thu, 30 Nov 2017 02:51:06 +0000 Thu, 27 Oct 2022 00:27:13 +0000 Thu, 27 Oct 2022 00:27:13 +0000 Lustre 2.10.0 0 11 <p>Actually I have tested such a setup on Power8 which is 64K page based. The only issue that came up was when dealing with the ko2iblnd witth map_on_demand enabled. Otherwise it works.</p> <p>Thanks for your replay, with the map_ondemand enabled, can the Lustre only support 4k kernel memory page?</p> <p>We definitely used to run Lustre with 64KB PAGE_SIZE on IA64 clients, and in theory this would still work but we haven't tested it in a long time.  We never had much success with 64KB PAGE_SIZE on the server, since this caused problems with 4KB PAGE_SIZE clients doing writes to the 64KB PAGE_SIZE server.</p> <p>Yes, I tested the 64KB PAGE_SIZE server with 4KB PAGE_SIZE Client and 64KB PAGE_SIZE Client, there are some errors both in these two clients.Thanks for help !</p> <p>It probably makes sense to print a build warning in the server code when PAGE_SIZE isn't 4096, just so people are aware that this isn't being tested. If someone starts testing this in the future, the warning can be removed. </p> <p>Once the RHEL ARM/Power8 server support work is complete we can test 64K pages on the server side.</p> <p>So I have managed to get Lustre ZFS servers running on Power8 nodes. I got it to mount and then it just locked up with any attempt to use the file system <img class="emoticon" src="https://jira.whamcloud.com/images/icons/emoticons/sad.png" height="16" width="16" align="absmiddle" alt="" border="0"/> Well its a start</p> <p>This time I tested ZFS lustre servers using the ethernet interface and it worked. Currently their is a bug in the RHEL7 alt kernel that I'm using in netlink that shows up when using k2oiblnd for some reason. Their appears to be a fix but requires rebuild the RHEL7 alt kernel. Now to test ldiskfs.</p> <p>James, I'd suggest to move your previous comment into a separate ticket related to 64KB PAGE_SIZE on the server, and leave this one for tracking 64KB PAGE_SIZE on the client. I suspect most people care about client-side support more than server-side, and this will help understand which issues are important to fix for the two different cases. In any case, it doesn't make sense to have multiple independent issues being worked on in the same Jira ticket.</p> <p>"James Simmons &lt;jsimmons@infradead.org&gt;" uploaded a new patch: <a href="https://review.whamcloud.com/45962" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/45962</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-10300" title="Can the Lustre 2.10.x clients support 64K kernel page? " class="issue-link" data-issue-key="LU-10300"><del>LU-10300</del></a> test: does arm testing work<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: 1<br/> Commit: 2036c3298804defa44e0457e65893e91d1da3985</p> <p>The aarch64 clients are working with any recent Lustre release.</p> Related LU-14970 LU-14346 LU-10157 LU-15364 LU-7650 LU-11597 LU-11785 LU-11788 LU-6387 LU-11200 LU-15293 LU-11671 LU-12255 LU-4398 LU-10073 LU-11729 LU-11595 LU-11596 LU-12014 LU-15722 LU-11667 LU-11787 LU-12362 LU-12419 LU-15223 Development Rank 1|hzzogv: Rank (Obsolete) 9223372036854775807