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List:       drbd-user
Subject:    No performance benefit from enabling csums-alg
From:       Tim Westbrook <Tim_Westbrook () selinc ! com>
Date:       2024-04-17 20:48:25
Message-ID: SJ0PR22MB28110C7139E52E43784310DAEA0F2 () SJ0PR22MB2811 ! namprd22 ! prod ! outlook ! com
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We are testing to see if enabling csums-alg would reduce resync times when we have to \
clear metadata or invalidate a node

I have a Primary (P) and two secondaries (S1, S2)

S2 is disabled (off) to simplify interactions. 

When do any of the following I see no appreciable difference in the time between \
Connecting state and Consistent between  systems with `csums-alg md5​ ` and one \
without that setting. [1]


* invalidate S1 on S1
* down drbd on S1 , clear metadata on S1, start drbd on S1
* disconnect network, create 1G file of 0s on P, reconnect network
* disconnect network, create 1G file of random on P, reconnect network 

This is on version 9.2.4 of the driver

Just trying to understand this feature better,.


Thanks,
Tim


[1]
  // with
  net {
    after-sb-1pri discard-secondary;
    verify-alg md5;
    csums-alg md5;
  }
  // without
  net {
    after-sb-1pri discard-secondary;
    verify-alg md5;
  }

  note -verify works so I assume the md5 ability is in the kernel


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