hi all
I have a Linux system I can boot with kernel 2.6.36.3 or 3.2.5 (the same
filesystem is mounted). The .config file from 2.6.36.3 was used for compiling
3.2.5.
The filesystem is a md raid1 with reiserfs. I can write sequentially with
32-33MB/s from both kernels to it.
The system runs netqmail-1.05 and just had ca. 8000 mails in the queue that
were "not yet preprocessed". I tried both kernels several times on this queue
for some time and found out that preprocessing is more than 3 times faster
on 2.6.36.3 (>30 mails/s) as with the default 3.2.5 kernel (ca. 10 mails/s).
Resource utilization as seen with top was not critical with both kernels but
the Blk_wrtn/s value from iostat was ca. 3 time higher with 2.6.36.3.
I run the same 3.2.5 kernel on 17 other systems and did not notice a
performance slowdown with other applications.
Is there a possibility that this slowdown is qmail related ? Does anyone have
a clue ?
Regards,
Michael Brunnbauer
--
++ Michael Brunnbauer
++ netEstate GmbH
++ Geisenhausener Straße 11a
++ 81379 München
++ Tel +49 89 32 19 77 80
++ Fax +49 89 32 19 77 89
++ E-Mail brunni@netestate.de
++ http://www.netestate.de/
++
++ Sitz: München, HRB Nr.142452 (Handelsregister B München)
++ USt-IdNr. DE221033342
++ Geschäftsführer: Michael Brunnbauer, Franz Brunnbauer
++ Prokurist: Dipl. Kfm. (Univ.) Markus Hendel
I have a Linux system I can boot with kernel 2.6.36.3 or 3.2.5 (the same
filesystem is mounted). The .config file from 2.6.36.3 was used for compiling
3.2.5.
The filesystem is a md raid1 with reiserfs. I can write sequentially with
32-33MB/s from both kernels to it.
The system runs netqmail-1.05 and just had ca. 8000 mails in the queue that
were "not yet preprocessed". I tried both kernels several times on this queue
for some time and found out that preprocessing is more than 3 times faster
on 2.6.36.3 (>30 mails/s) as with the default 3.2.5 kernel (ca. 10 mails/s).
Resource utilization as seen with top was not critical with both kernels but
the Blk_wrtn/s value from iostat was ca. 3 time higher with 2.6.36.3.
I run the same 3.2.5 kernel on 17 other systems and did not notice a
performance slowdown with other applications.
Is there a possibility that this slowdown is qmail related ? Does anyone have
a clue ?
Regards,
Michael Brunnbauer
--
++ Michael Brunnbauer
++ netEstate GmbH
++ Geisenhausener Straße 11a
++ 81379 München
++ Tel +49 89 32 19 77 80
++ Fax +49 89 32 19 77 89
++ E-Mail brunni@netestate.de
++ http://www.netestate.de/
++
++ Sitz: München, HRB Nr.142452 (Handelsregister B München)
++ USt-IdNr. DE221033342
++ Geschäftsführer: Michael Brunnbauer, Franz Brunnbauer
++ Prokurist: Dipl. Kfm. (Univ.) Markus Hendel