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<p class="MsoNormal"><span style="font-size:11.0pt">From what I can see they exist on my 2.12.3 client node:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">[root@rufus4 ~]# lctl list_param -R llite | grep max_read_ahead<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">llite.reprofs-ffff9f7c3b4a8800.max_read_ahead_mb<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">llite.reprofs-ffff9f7c3b4a8800.max_read_ahead_per_file_mb<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">llite.reprofs-ffff9f7c3b4a8800.max_read_ahead_whole_mb<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black">Diego</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal" style="margin-left:36.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">Pinkesh Valdria <pinkesh.valdria@oracle.com><br>
<b>Date: </b>Wednesday, 11 December 2019 at 17:46<br>
<b>To: </b>"Moreno Diego (ID SIS)" <diego.moreno@id.ethz.ch>, "lustre-discuss@lists.lustre.org" <lustre-discuss@lists.lustre.org><br>
<b>Subject: </b>Re: [lustre-discuss] Degraded read performance with Large Bulk IO (16MB RPC)<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
</div>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">I was not able to find those parameters on my client nodes,  OSS or MGS nodes.   Here is how I was extracting all parameters . 
</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black">mkdir -p lctl_list_param_R/</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black">cd lctl_list_param_R/</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black">lctl list_param -R *  > lctl_list_param_R</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">[opc@lustre-client-1 lctl_list_param_R]$ less lctl_list_param_R  | grep ahead</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">llite.lfsbv-ffff98231c3bc000.statahead_agl</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">llite.lfsbv-ffff98231c3bc000.statahead_max</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">llite.lfsbv-ffff98231c3bc000.statahead_running_max</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">llite.lfsnvme-ffff98232c30e000.statahead_agl</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">llite.lfsnvme-ffff98232c30e000.statahead_max</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">llite.lfsnvme-ffff98232c30e000.statahead_running_max</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">[opc@lustre-client-1 lctl_list_param_R]$</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">I also tried these commands: 
</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><b><span style="font-size:11.0pt"> </span></b><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><b><span style="font-size:11.0pt">Not working:
</span></b><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><b><span style="font-size:11.0pt">On client nodes</span></b><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">lctl get_param llite.lfsbv-*.max_read_ahead_mb</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">error: get_param: param_path 'llite/lfsbv-*/max_read_ahead_mb': No such file or directory</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">[opc@lustre-client-1 lctl_list_param_R]$</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><b><span style="font-size:11.0pt"> </span></b><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><b><span style="font-size:11.0pt">Works
</span></b><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><b><span style="font-size:11.0pt">On client nodes</span></b><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">lctl get_param llite.*.statahead_agl</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">llite.lfsbv-ffff98231c3bc000.statahead_agl=1</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">llite.lfsnvme-ffff98232c30e000.statahead_agl=1</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">[opc@lustre-client-1 lctl_list_param_R]$</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">"Moreno Diego (ID SIS)" <diego.moreno@id.ethz.ch><br>
<b>Date: </b>Tuesday, December 10, 2019 at 2:06 AM<br>
<b>To: </b>Pinkesh Valdria <pinkesh.valdria@oracle.com>, "lustre-discuss@lists.lustre.org" <lustre-discuss@lists.lustre.org><br>
<b>Subject: </b>Re: [lustre-discuss] Degraded read performance with Large Bulk IO (16MB RPC)</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">With that kind of degradation performance on read I would immediately think on llite’s max_read_ahead parameters on the client. Specifically these 2:</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">max_read_ahead_mb: total amount of MB allocated for read ahead, usually quite low for bandwidth benchmarking purposes and when there’re several files per client</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">max_read_ahead_per_file_mb: the default is quite low for 16MB RPCs (only a few RPCs per file)</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">You probably need to check the effect increasing both of them.</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt">Regards,</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt;color:black">Diego</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:72.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">lustre-discuss <lustre-discuss-bounces@lists.lustre.org> on behalf of Pinkesh Valdria <pinkesh.valdria@oracle.com><br>
<b>Date: </b>Tuesday, 10 December 2019 at 09:40<br>
<b>To: </b>"lustre-discuss@lists.lustre.org" <lustre-discuss@lists.lustre.org><br>
<b>Subject: </b>[lustre-discuss] Degraded read performance with Large Bulk IO (16MB RPC)</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:11.0pt">I was expecting better or same read performance with Large Bulk IO (16MB RPC),  but I see degradation in performance.   Do I need to tune any other parameter to benefit from Large
 Bulk IO?   Appreciate if I can get any pointers to troubleshoot further. </span>
<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:72.0pt"><b><span style="font-size:11.0pt">Throughput before
</span></b><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:108.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">         
</span></span><![endif]><span style="font-size:11.0pt">Read:  2563 MB/s</span><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:108.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">         
</span></span><![endif]><span style="font-size:11.0pt">Write:  2585 MB/s</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:72.0pt"><b><span style="font-size:11.0pt">Throughput after</span></b><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:108.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo4">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">         
</span></span><![endif]><span style="font-size:11.0pt">Read:  1527 MB/s. (down by ~1025)</span><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:108.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo4">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">         
</span></span><![endif]><span style="font-size:11.0pt">Write:  2859 MB/s</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:72.0pt"><b><span style="font-size:11.0pt">Changes I did are:
</span></b><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:11.0pt">On oss</span><o:p></o:p></p>
<p class="p1" style="margin-left:108.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo4">
<![if !supportLists]><span style="font-family:"Calibri",sans-serif"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">         
</span></span></span><![endif]><i>lctl set_param obdfilter.lfsbv-*.brw_size=16</i><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:11.0pt">On clients
</span><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:108.0pt;text-indent:-18.0pt;mso-list:l3 level1 lfo6">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">         
</span></span><![endif]><span style="font-size:11.0pt">unmounted and remounted</span><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:108.0pt;text-indent:-18.0pt;mso-list:l3 level1 lfo6">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">         
</span></span><![endif]><span style="font-size:10.0pt">lctl set_param <i>osc.lfsbv-OST*.max_pages_per_rpc</i>=4096  (got auto-updated after re-mount)</span><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:108.0pt;text-indent:-18.0pt;mso-list:l3 level1 lfo6">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">         
</span></span><![endif]><span style="font-size:11.0pt">lctl set_param osc.*.max_rpcs_in_flight=64   (Had to manually increase this to 64,  since after re-mount, it was auto-set to 8,  but read/write performance was poor)</span><o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:108.0pt;text-indent:-18.0pt;mso-list:l3 level1 lfo6">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">         
</span></span><![endif]><span style="font-size:11.0pt">lctl set_param osc.*.max_dirty_mb=2040. (setting the value to 2048 was failing with : Numerical result out of range error.   Previously it was set to 2000 when I got good performance.
</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:11.0pt;color:black">My other settings:
</span><o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">         
</span></span><![endif]><span style="font-size:9.0pt;font-family:Menlo;color:black">lnetctl net add --net tcp1 --if $interface  –peer-timeout 180 –peer-credits 128 –credits 1024</span><o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">         
</span></span><![endif]><span style="font-size:9.0pt;font-family:Menlo;color:black">echo "options ksocklnd nscheds=10 sock_timeout=100 credits=2560 peer_credits=63 enable_irq_affinity=0"  >  /etc/modprobe.d/ksocklnd.conf</span><o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">         
</span></span><![endif]><span style="font-size:9.0pt;font-family:Menlo;color:black">lfs setstripe -c 1 -S 1M /mnt/mdt_bv/test1</span><o:p></o:p></p>
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