@Andrey, it is noted that ZFS I/O can slow down when ZFS volumes fill
up, noticeably at around 80-85% full capacity writes can slow
dramatically while free space is being found. Is this possibly the
reason for the speed bottleneck?
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After a lot of tests on AWS with generic and AWS kernels and on non-AWS
bare-metal systems with the AWS and generic kernels I discovered that
one gets I/O throttling on AWS instances regardless of using ZFS or not.
I ran a really simple test writing and reading to the raw device and
found the *sam
Reproducible.
** Changed in: zfs-linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1883676
Title:
ZFS performance drops suddenly
Status
** Changed in: zfs-linux (Ubuntu)
Importance: Undecided => High
** Changed in: zfs-linux (Ubuntu)
Assignee: (unassigned) => Colin Ian King (colin-king)
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https://b
Oh, no problem, I can see that in the bug report. Apologies.
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https://bugs.launchpad.net/bugs/1883676
Title:
ZFS performance drops suddenly
Status in zfs-linux package
Can you inform me the exact test configuration you were using?
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Title:
ZFS performance drops suddenly
Status in zfs-linux packa
It would be interesting in knowing the following data:
1. How much memory does the machine have when booted?
run: free
2. What the arcstats look like when it goes slowly
use: cat /proc/spl/kstat/zfs/arcstats
thanks
** Changed in: zfs-linux (Ubuntu)
Status: Confirmed => Incomplete
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I've been examining the zfs_arc_max setting to see if this can stabilize
the I/O performance. You may like to try setting this as a proportion of
your available memory to see if it improves things. For example, with a
machine with 8GB of memory, I set this to 2GB and my test system went
from being
Hi Andrey, does setting zfs_arc_max resolve your issue?
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https://bugs.launchpad.net/bugs/1883676
Title:
ZFS performance drops suddenly
Status in zfs-linux package in U
1. free
totalusedfree shared buff/cache
available
Mem:8025436 1255616 6457736 11780 312084
6512296
Swap: 1425404 0 1425404
2. cat /proc/spl/kstat/zfs/arcstats
12 1 0x01 98 26656 4085867100 20862566338548
name
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