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From: Wolfgang Denk <wd@denx.de>
To: Piergiorgio Sartor <piergiorgio.sartor@nexgo.de>
Cc: linux-raid@vger.kernel.org
Subject: Re: raid6check extremely slow ?
Date: Mon, 11 May 2020 08:33:42 +0200	[thread overview]
Message-ID: <20200511063342.1D483240E1A@gemini.denx.de> (raw)
In-Reply-To: <20200510132611.GA12994@lazy.lzy>

Dear Piergiorgio,

In message <20200510132611.GA12994@lazy.lzy> you wrote:
>
> raid6check is CPU bounded, no vector optimization
> and no multithread.
>
> Nevertheless, if you see no CPU load (single core
> load), then something else is not OK, but I've no
> idea what it could be.
>
> Please check if one core is up 100%, if this is
> the case, then there is the limit.
> If not, sorry, I cannot help.

No, there is virtually no CPU load at all:

top - 08:32:36 up 8 days, 16:34,  3 users,  load average: 1.00, 1.01, 1.00
Tasks: 243 total,   1 running, 242 sleeping,   0 stopped,   0 zombie
%Cpu0  :  0.0 us,  0.0 sy,  0.0 ni, 98.7 id,  0.0 wa,  1.3 hi,  0.0 si,  0.0 st
%Cpu1  :  0.0 us,  0.0 sy,  0.0 ni,100.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu2  :  0.0 us,  0.0 sy,  0.0 ni,100.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu3  :  0.3 us,  1.3 sy,  0.0 ni, 97.7 id,  0.0 wa,  0.3 hi,  0.3 si,  0.0 st
%Cpu4  :  0.0 us,  0.0 sy,  0.0 ni,100.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu5  :  1.7 us,  3.7 sy,  0.0 ni, 90.4 id,  3.0 wa,  0.7 hi,  0.7 si,  0.0 st
%Cpu6  :  0.0 us,  0.0 sy,  0.0 ni,100.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
%Cpu7  :  0.0 us,  0.0 sy,  0.0 ni,100.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
MiB Mem :  24034.6 total,  10921.2 free,   1882.4 used,  11230.9 buff/cache
MiB Swap:   7828.5 total,   7828.5 free,      0.0 used.  21757.0 avail Mem

What I find interesting is thet all disks are more or less
constantly at around 400 kB/s (390...400, never more).

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
That's their goal, remember, a goal that's really contrary to that of
the programmer or administrator. We just want to get our  jobs  done.
$Bill  just  wants  to  become  $$Bill. These aren't even marginallly
congruent.
         -- Tom Christiansen in <6jhtqk$qls$1@csnews.cs.colorado.edu>

  reply	other threads:[~2020-05-11  6:33 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-10 12:07 raid6check extremely slow ? Wolfgang Denk
2020-05-10 13:26 ` Piergiorgio Sartor
2020-05-11  6:33   ` Wolfgang Denk [this message]
2020-05-10 22:16 ` Guoqing Jiang
2020-05-11  6:40   ` Wolfgang Denk
2020-05-11  8:58     ` Guoqing Jiang
2020-05-11 15:39       ` Piergiorgio Sartor
2020-05-12  7:37         ` Wolfgang Denk
2020-05-12 16:17           ` Piergiorgio Sartor
2020-05-13  6:13             ` Wolfgang Denk
2020-05-13 16:22               ` Piergiorgio Sartor
2020-05-11 16:14       ` Piergiorgio Sartor
2020-05-11 20:53         ` Giuseppe Bilotta
2020-05-11 21:12           ` Guoqing Jiang
2020-05-11 21:16             ` Guoqing Jiang
2020-05-12  1:52               ` Giuseppe Bilotta
2020-05-12  6:27                 ` Adam Goryachev
2020-05-12 16:11                   ` Piergiorgio Sartor
2020-05-12 16:05           ` Piergiorgio Sartor
2020-05-11 21:07         ` Guoqing Jiang
2020-05-11 22:44           ` Peter Grandi
2020-05-12 16:09             ` Piergiorgio Sartor
2020-05-12 20:54               ` antlists
2020-05-13 16:18                 ` Piergiorgio Sartor
2020-05-13 17:37                   ` Wols Lists
2020-05-13 18:23                     ` Piergiorgio Sartor
2020-05-12 16:07           ` Piergiorgio Sartor
2020-05-12 18:16             ` Guoqing Jiang
2020-05-12 18:32               ` Piergiorgio Sartor
2020-05-13  6:18                 ` Wolfgang Denk
2020-05-13  6:07             ` Wolfgang Denk
2020-05-15 10:34               ` Andrey Jr. Melnikov
2020-05-15 11:54                 ` Wolfgang Denk
2020-05-15 12:58                   ` Guoqing Jiang
2020-05-14 17:20 ` Roy Sigurd Karlsbakk
2020-05-14 18:20   ` Wolfgang Denk
2020-05-14 19:51     ` Roy Sigurd Karlsbakk
2020-05-15  8:08       ` Wolfgang Denk

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