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Abe,<br>
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You gave some general info, but unless I missed something, nothing specific to show any involvement by swap. How did you determine that? Can you share that data? And what performance are you expecting here?<br>
<br>
- Patrick<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> lustre-devel <lustre-devel-bounces@lists.lustre.org> on behalf of Abe Asraoui <AbeA@supermicro.com><br>
<b>Sent:</b> Friday, December 28, 2018 6:42:50 PM<br>
<b>To:</b> Lustre Developement; lustre-discuss@lists.lustre.org; Abe Asraoui<br>
<b>Subject:</b> Re: [lustre-devel] ldiskfs performance degradation due to kernel swap hugging cpu</font>
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+ lustre-discuss <br>
<br>
<br>
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Hi All.<br>
We are seeing low performance with lustre2.11 in ldiskfs configuration with obdfilter survey, not sure if this is a known issue.<br>
<br>
obdfilter survery under ldiskfs performance is impacted by kernel swap hugging cpu usage, current configurations is as follows:<br>
2 osts: ost1,ost2<br>
/dev/sdc on /mnt/mdt type lustre (ro,context=unconfined_u:object_r:user_tmp_t:s0,svname=tempAA-MDT0000,mgs,osd=osd-ldiskfs,user_xattr,errors=remount-ro)<br>
/dev/sdb on /mnt/ost1 type lustre (ro,context=unconfined_u:object_r:user_tmp_t:s0,svname=tempAA-OST0001,mgsnode=10.10.10.168@o2ib,osd=osd-ldiskfs,errors=remount-ro)<br>
/dev/sda on /mnt/ost2 type lustre (ro,context=unconfined_u:object_r:user_tmp_t:s0,svname=tempAA-OST0002,mgsnode=10.10.10.168@o2ib,osd=osd-ldiskfs,errors=remount-ro)<br>
[root@oss100 htop-2.2.0]#<br>
[root@oss100 htop-2.2.0]# dkms status<br>
lustre-ldiskfs, 2.11.0, 3.10.0-693.21.1.el7_lustre.x86_64, x86_64: installed<br>
spl, 0.7.6, 3.10.0-693.21.1.el7_lustre.x86_64, x86_64: installed<br>
[root@oss100 htop-2.2.0]#<br>
sh ./obdsurvey-script.sh <br>
Mon Dec 10 17:19:52 PST 2018 Obdfilter-survey for case=disk from oss100<br>
ost 2 sz 512000000K rsz 1024K obj 2 thr 2 write 134.52 [ 49.99, 101.96] rewrite 132.09 [ 49.99, 78.99] read 2566.74 [ 258.96, 2068.71]
<br>
ost 2 sz 512000000K rsz 1024K obj 2 thr 4 write 195.73 [ 76.99, 128.98] rewrite<br>
root@oss100 htop-2.2.0]# lctl dl<br>
0 UP osd-ldiskfs tempAA-MDT0000-osd tempAA-MDT0000-osd_UUID 9<br>
1 UP mgs MGS MGS 4<br>
2 UP mgc MGC10.10.10.168@o2ib 65f231a0-8fd8-001d-6b0f-3e986f914178 4<br>
3 UP mds MDS MDS_uuid 2<br>
4 UP lod tempAA-MDT0000-mdtlov tempAA-MDT0000-mdtlov_UUID 3<br>
5 UP mdt tempAA-MDT0000 tempAA-MDT0000_UUID 8<br>
6 UP mdd tempAA-MDD0000 tempAA-MDD0000_UUID 3<br>
7 UP qmt tempAA-QMT0000 tempAA-QMT0000_UUID 3<br>
8 UP lwp tempAA-MDT0000-lwp-MDT0000 tempAA-MDT0000-lwp-MDT0000_UUID 4<br>
9 UP osd-ldiskfs tempAA-OST0001-osd tempAA-OST0001-osd_UUID 4<br>
10 UP ost OSS OSS_uuid 2<br>
11 UP obdfilter tempAA-OST0001 tempAA-OST0001_UUID 5<br>
12 UP lwp tempAA-MDT0000-lwp-OST0001 tempAA-MDT0000-lwp-OST0001_UUID 4<br>
13 UP osp tempAA-OST0001-osc-MDT0000 tempAA-MDT0000-mdtlov_UUID 4<br>
14 UP echo_client tempAA-OST0001_ecc tempAA-OST0001_ecc_UUID 2<br>
15 UP osd-ldiskfs tempAA-OST0002-osd tempAA-OST0002-osd_UUID 4<br>
16 UP obdfilter tempAA-OST0002 tempAA-OST0002_UUID 5<br>
17 UP lwp tempAA-MDT0000-lwp-OST0002 tempAA-MDT0000-lwp-OST0002_UUID 4<br>
18 UP osp tempAA-OST0002-osc-MDT0000 tempAA-MDT0000-mdtlov_UUID 4<br>
19 UP echo_client tempAA-OST0002_ecc tempAA-OST0002_ecc_UUID 2<br>
[root@oss100 htop-2.2.0]#<br>
root@oss100 htop-2.2.0]# lsblk<br>
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT<br>
sda 8:0 0 152.8T 0 disk /mnt/ost2<br>
sdb 8:16 0 152.8T 0 disk /mnt/ost1<br>
sdc 8:32 0 931.5G 0 disk /mnt/mdt<br>
sdd 8:48 0 465.8G 0 disk <br>
\u251c\u2500sdd1 8:49 0 200M 0 part /boot/efi<br>
\u251c\u2500sdd2 8:50 0 1G 0 part /boot<br>
\u2514\u2500sdd3 8:51 0 464.6G 0 part <br>
\u251c\u2500centos-root 253:0 0 50G 0 lvm /<br>
\u251c\u2500centos-swap 253:1 0 4G 0 lvm [SWAP]<br>
\u2514\u2500centos-home 253:2 0 410.6G 0 lvm /home<br>
nvme0n1 259:2 0 372.6G 0 disk <br>
\u2514\u2500md124 9:124 0 372.6G 0 raid1 <br>
nvme1n1 259:0 0 372.6G 0 disk <br>
\u2514\u2500md124 9:124 0 372.6G 0 raid1 <br>
nvme2n1 259:3 0 372.6G 0 disk <br>
\u2514\u2500md125 9:125 0 354G 0 raid1 <br>
nvme3n1 259:1 0 372.6G 0 disk <br>
\u2514\u2500md125 9:125 0 354G 0 raid1<br>
<br>
thanks,<br>
Abe<br>
<br>
<br>
<br>
<br>
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