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--- devsummit:201510:performance [2015/09/24 22:03] – DanLangille
+++ devsummit:201510:performance [2021/04/25 07:12] (current) – Move to DevSummit namespace. JethroNederhof
@@ Line 20: / Line 20: @@
 ==== Attending ====
-In order to attend you need register for the [[/DevSummit|developer summit]] as well as by email for the session and be confirmed by the working group organizer.  Follow the guidelines described on the [[/201510DevSummit|main page]] or what you received by email.  For questions or if in doubt ask the session chairs.
+In order to attend you need register for the [[/DevSummit|developer summit]] as well as by email for the session and be confirmed by the working group organizer.  Follow the guidelines described on the [[DevSummit/201510|main page]] or what you received by email.  For questions or if in doubt ask the session chairs.
-**Please do NOT add yourself here.** Your name will appear automatically once you have received the confirmation email. You need to put your name on the general [[/201405DevSummit|developer summit]] attendees list though.
+**Please do NOT add yourself here.** Your name will appear automatically once you have received the confirmation email. You need to put your name on the general [[DevSummit/201405|developer summit]] attendees list though.
 ^ Name ^ Username / Affiliation ^ Topics of Interest ^ Notes ^
-| Dan Langille |  | all |  |
+| [[/DanLangille|DanLangille]] | dvl | all |  |
+| [[/MarceloAraujo|MarceloAraujo]] | araujo | zfs benchmark |  |
+| [[/AllanJude|AllanJude]] | allanjude | ZFS |  |
+==== Notes ====
+The original notes taken during session: https://etherpad.net/p/2015Dev_Summit_Performance
+Copy paste of above, so it's here:
+Matt Ahrens Blog about ZFS stripe width: http://blog.delphix.com/matt/2014/06/06/zfs-stripe-width/
+How long does it take to resilver with:
+  * differing numbers of drives
+  * used space (25%, 50%, 75%, 85%)
+  * different raid levels
+  * different fragmentation levels
+  * resilver times under load, and while idle. (how to simulate an even level of load, mbuffer -R)
+raid z: repeat benchmarks for each number of disks, and look for *-modal distributions
+bcr: steal his dtrace script
+steal Adam Leventhal's dtrace scripts, and Brenden Greggs
+jmg has latency checking script
+Ensure block sizes of the drives are identical (expect 4k) (For enterprise, most of the HDD are still 512B of block size (512n or 512e?%%))%% 512 native.
+marcelo / bapt have some benchmarking tools: Zopkio to dispatch, collect and process logs (Used at gandi)
+zfs snapshot performance, delete 10,000s of snapshots = degraded performance until reboot
+benchmark 'zfs list' with different levels of snapshots
+disable during benchmarking:
+  * crontab
+  * sendmail
+Use an automated framework like this: https://github.com/ocochard/netbenches
+https://github.com/ocochard/netbenches
+compression benchmarks
+  * lz4 vs gzip
+  * gzip 1 - 9