** Changed in: debian
Status: New => Fix Released
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Title:
/proc/diskstats shows weird values
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** Tags added: ubuntu-certified
** Tags added: cscc
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Title:
/proc/diskstats shows weird values
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** Changed in: debian
Status: Unknown => New
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Title:
/proc/diskstats shows weird values
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** Bug watch added: Debian Bug tracker #927184
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=927184
** Also affects: debian via
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=927184
Importance: Unknown
Status: Unknown
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After rebooting, the values are < 2^31 and utilization is reporting
fine. I feel this is a 31/32 bit overflow issue.
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Title:
/proc/diskstats show
https://forums.fedoraforum.org/showthread.php?318580-iostat-svctm-and-
busy-numbers-are-wrong-for-NVME-drives
I think summing wr_ticks and rd_ticks might actually be the right
solution.
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Here is my patch for munin diskstats:
diff -u diskstats-dist diskstats
--- diskstats-dist 2018-09-29 16:28:39.933727540 -0700
+++ diskstats 2018-11-12 09:54:56.850815309 -0800
@@ -234,6 +234,9 @@
# a given second, the device is nearly 100% saturated.
my $utilization = $tot_ticks /
iostat is showing the same thing btw.
See also https://access.redhat.com/solutions/1462993
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Title:
/proc/diskstats shows weird values
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https://www.redhat.com/archives/dm-devel/2015-June/msg00042.html
https://www.redhat.com/archives/dm-devel/2015-June/msg00057.html
Something is really really screwy here.
Some stats are in ns, some are in ms:
Index: linux-4.1-rc7/Documentation/device-mapper/statistics.txt
===
drivers/md/dm-stats.c:
static void dm_stat_round(struct dm_stat *s, struct dm_stat_shared *shared,
struct dm_stat_percpu *p)
{
/*
* This is racy, but so is part_round_stats_single.
*/
unsigned long long now, difference;
unsigned i
It looks like partitions are being reported correctly, just not the main
device
$ cat /proc/diskstats | awk '{print $3, $7, $11, $7+$11, $13, $14}' | grep nvme
nvme0n1 22988 457568 480556 2440737408 2441207708
nvme0n1p1 22988 339624 362612 528884 978496
nvme0n1p2 0 0 0 0 0
nvme0n1p5 0 0 0 4 4
No
On my laptop with a SATA ssd I also have higher reported times than
process real time, albeit not by such a huge margin. Only a factor of
2-4 too high.
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Testing with http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19-rc2/
shows:
Writes on the sd card are still reported about a factor 1000 too high, e.g.
2700ms = 27000s where I expect around 27s.
I tried on an nvme ssd with the same result, just smaller numbers and
/dev/urandom was the bottl
** Tags added: kernel-bug-exists-upstream
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Title:
/proc/diskstats shows weird values
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I noticed the bug only after I installed munin recently. I don't know
how long it may have existed before.
I will test the mainline kernel as soon as I can but since the machine
is used in production and can't be rebooted at will so testing probably
be 2 weeks out.
Thanks for your reply.
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Did this issue start happening after an update/upgrade? Was there a
prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.19 kernel[
apport information
** Tags added: apport-collected
** Description changed:
For one block device on one of my servers munin shows abnormally high
latency.
When querying /proc/diskstats manually, the device in question shows:
8 32 sdc 973668 361965 64248290 10224376 755130 51816
** Package changed: munin (Ubuntu) => linux (Ubuntu)
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Title:
/proc/diskstats shows weird values
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