1. free
total used free 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 type data
hits 4 8977275
misses 4 20770
demand_data_hits 4 7154775
demand_data_misses 4 13760
demand_metadata_hits 4 1810210
demand_metadata_misses 4 4292
prefetch_data_hits 4 112
prefetch_data_misses 4 719
prefetch_metadata_hits 4 12178
prefetch_metadata_misses 4 1999
mru_hits 4 4041554
mru_ghost_hits 4 0
mfu_hits 4 4923504
mfu_ghost_hits 4 0
deleted 4 31
mutex_miss 4 0
access_skip 4 9
evict_skip 4 124
evict_not_enough 4 0
evict_l2_cached 4 0
evict_l2_eligible 4 396800
evict_l2_ineligible 4 8192
evict_l2_skip 4 0
hash_elements 4 20337
hash_elements_max 4 22033
hash_collisions 4 82157
hash_chains 4 196
hash_chain_max 4 2
p 4 2054511616
c 4 4109023232
c_min 4 256813952
c_max 4 4109023232
size 4 1856513648
compressed_size 4 1349638144
uncompressed_size 4 1738882048
overhead_size 4 446370304
hdr_size 4 7828496
data_size 4 1709473792
metadata_size 4 86534656
dbuf_size 4 9437376
dnode_size 4 23086368
bonus_size 4 20152960
anon_size 4 438411264
anon_evictable_data 4 0
anon_evictable_metadata 4 0
mru_size 4 1186710528
mru_evictable_data 4 908280320
mru_evictable_metadata 4 4658688
mru_ghost_size 4 0
mru_ghost_evictable_data 4 0
mru_ghost_evictable_metadata 4 0
mfu_size 4 170886656
mfu_evictable_data 4 134954496
mfu_evictable_metadata 4 3134976
mfu_ghost_size 4 0
mfu_ghost_evictable_data 4 0
mfu_ghost_evictable_metadata 4 0
l2_hits 4 0
l2_misses 4 0
l2_feeds 4 0
l2_rw_clash 4 0
l2_read_bytes 4 0
l2_write_bytes 4 0
l2_writes_sent 4 0
l2_writes_done 4 0
l2_writes_error 4 0
l2_writes_lock_retry 4 0
l2_evict_lock_retry 4 0
l2_evict_reading 4 0
l2_evict_l1cached 4 0
l2_free_on_write 4 0
l2_abort_lowmem 4 0
l2_cksum_bad 4 0
l2_io_error 4 0
l2_size 4 0
l2_asize 4 0
l2_hdr_size 4 0
memory_throttle_count 4 0
memory_direct_count 4 0
memory_indirect_count 4 0
memory_all_bytes 4 8218046464
memory_free_bytes 4 5230358528
memory_available_bytes 3 5101953024
arc_no_grow 4 0
arc_tempreserve 4 0
arc_loaned_bytes 4 0
arc_prune 4 0
arc_meta_used 4 147039856
arc_meta_limit 4 3081767424
arc_dnode_limit 4 308176742
arc_meta_max 4 152895280
arc_meta_min 4 16777216
async_upgrade_sync 4 59
demand_hit_predictive_prefetch 4 484
demand_hit_prescient_prefetch 4 0
arc_need_free 4 0
arc_sys_free 4 128406976
arc_raw_size 4 0
This behavior was observed on more than one machine, both small and large
(the large was on AWS).
Thanks,
Andrey Gelman
On Mon, Jul 13, 2020 at 5:45 PM Colin Ian King <[email protected]>
wrote:
> 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
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1883676
>
> Title:
> ZFS performance drops suddenly
>
> Status in zfs-linux package in Ubuntu:
> Incomplete
>
> Bug description:
> Run Phoronix Flexible IO / Random write benchmark.
> After running the benchmark repeatedly multiple times (occasionally it
> can be 30 minutes or 8 hours), the performance drops suddenly. The only way
> (I know of) to get back to high performance is reboot.
> ---
> $ for i in $(seq 1 1000); do printf "2\n4\n2\n1\n1\n1\nn\n" |
> phoronix-test-suite run fio | awk '/Average.*IOPS/ {print $2}' >>
> /tmp/iops; done
> $ less /tmp/iops
> ...
> 2095
> 2095
> 2093
> 783
> 388
> 389
> ...
>
> ProblemType: Bug
> DistroRelease: Ubuntu 18.04
> Package: zfsutils-linux 0.7.5-1ubuntu16.9
> ProcVersionSignature: User Name 5.3.0-1023.25~18.04.1-aws 5.3.18
> Uname: Linux 5.3.0-1023-aws x86_64
> NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
> ApportVersion: 2.20.9-0ubuntu7.15
> Architecture: amd64
> Date: Tue Jun 16 08:55:01 2020
> Ec2AMI: ami-06fd83ae47b05282f
> Ec2AMIManifest: (unknown)
> Ec2AvailabilityZone: us-east-1f
> Ec2InstanceType: c4.xlarge
> Ec2Kernel: unavailable
> Ec2Ramdisk: unavailable
> SourcePackage: zfs-linux
> UpgradeStatus: No upgrade log present (probably fresh install)
> modified.conffile..etc.sudoers.d.zfs: [deleted]
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1883676/+subscriptions
>
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1883676
Title:
ZFS performance drops suddenly
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1883676/+subscriptions
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