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-16368 Lustre <p>The provided ZFS RPMs for RHEL86 Lustre servers are appearently built without vectorization support for raidz and fletcher4.</p> <p>The available algorithms are benchmarked on module load. The benchmarked implementations can be checked under</p> <div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent"> <pre class="code-java"> cat /proc/spl/kstat/zfs/fletcher_4_bench implementation   <span class="code-keyword">native</span>         byteswap scalar           5497759569     4845665644 superscalar      5480937676     4858516672 superscalar4     5488439650     4847575376 fastest          scalar         superscalar cat /proc/spl/kstat/zfs/vdev_raidz_bench implementation   gen_p           gen_pq          gen_pqr         rec_p           rec_q           rec_r           rec_pq          rec_pr          rec_qr          rec_pqr original         254722784       200239743       97275027        1207670510      225639247       35724759        87910053        20776517        20811404        13297656 scalar           1234755379      393704159       159539402       1211544896      385637841       266021529       195891453       153232648       90736440        81828326 fastest          scalar          scalar          scalar          scalar          scalar          scalar          scalar          scalar          scalar          scalar </pre> </div></div> <p>The same hardware with official ZFS RPMs supports further optimizations, e.g.:</p> <div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent"> <pre class="code-java"> cat /proc/spl/kstat/zfs/fletcher_4_bench implementation   <span class="code-keyword">native</span>         byteswap scalar           6421841866     4605167866 superscalar      9151122207     5740950514 superscalar4     8273988438     6065318192 sse2             10187627568    2365144114 ssse3            10428775432    7506302223 avx2             24481349937    19454027999 avx512f          35018614756    10724551066 avx512bw         36102325545    30780239769 fastest          avx512bw       avx512bw</pre> </div></div> <p>A noticable performance improvement on high throughput scenarios could be observerd when changing to official ZFS RPMs with proper vectorization support.</p> RHEL8.6 LU-16368

ZFS RPMs without vectorization

Improvement Minor Open Unresolved WC Triage Patrick Keller performance zfs Tue, 6 Dec 2022 12:40:18 +0000 Tue, 6 Dec 2022 12:40:18 +0000 Lustre 2.15.1 0 1 Development Epic/Theme ZFS Rank 1|i0375r: Rank (Obsolete) 9223372036854775807