[Akonadi] [Bug 321944] synchronizing large about 77000 mail Linux kernel mailing list folder blocks out KMail for more than 15 minutes

[Martin Steigerwald]

https://bugs.kde.org/show_bug.cgi?id=321944

--- Comment #4 from Martin Steigerwald <Martin at Lichtvoll.de> ---
Sergio, thank you for your interesting to look into this.

I sent you a mail with link to upload. Note: Akonadi stuff and maildir is on
BTRFS on my system, but I pretty much think that does not matter here, as the
workload is clearly not I/O bound:

merkaba:~> atopsar -d -b 0:00 -e 1:00 

merkaba  3.10.0-tp520  #18 SMP PREEMPT Tue Jul 2 09:41:49 CEST 2013  x86_64 
2013/07/04

-------------------------- analysis date: 2013/07/04 --------------------------

00:00:02  disk           busy read/s KB/read  writ/s KB/writ avque avserv _dsk_
00:10:02  sdb              0%    0.0     0.0     0.0     0.0   0.0   0.00 ms
          sda              2%   66.8    34.3    17.6    16.1  12.0   0.26 ms
00:20:02  sda              0%    0.1     4.0     9.5     8.2  18.9   0.07 ms
00:30:02  sda              1%   27.7    22.2    16.8    18.4   8.7   0.28 ms
00:36:21  sda              1%   32.0    12.8    24.6    20.3  12.4   0.18 ms

merkaba:~> atopsar -d -b 10:30 -e 11:30

merkaba  3.10.0-tp520  #18 SMP PREEMPT Tue Jul 2 09:41:49 CEST 2013  x86_64 
2013/07/04

-------------------------- analysis date: 2013/07/04 --------------------------

10:51:12  disk           busy read/s KB/read  writ/s KB/writ avque avserv _dsk_
11:01:12  sdb              0%    0.0     0.0     0.0     0.0   0.0   0.00 ms
          sda              6%  225.2    35.9    28.4    27.1  23.3   0.25 ms
11:11:12  sda              2%   70.5    27.3    27.9    21.2  23.2   0.19 ms
11:21:12  sda              7%  217.4    22.9    24.8    31.7  11.0   0.29 ms

sda is the primary Intel SSD 320 where data resided. sdb is a new Intel mSATA
SSD that I do not yet use.

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