Bug #16689: mkfs.xfs slow performance with discards and object map - rbd - Ceph

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Bug #16689

closed

mkfs.xfs slow performance with discards and object map

Added by Jason Dillaman almost 8 years ago. Updated over 7 years ago.

Status:

Resolved

Priority:

High

Assignee:

Jason Dillaman

Target version:

% Done:

Source:

other

Tags:

Backport:

jewel

Regression:

Severity:

3 - minor

Reviewed:

Affected Versions:

ceph-qa-suite:

Pull request ID:

Crash signature (v1):

Crash signature (v2):

Description

Examples:

object-map enabled:
time mkfs.xfs -s size=4096 -f /dev/sda
real 9m10.882s
user 0m0.000s
sys 0m0.012s

object-map disabled:
real 0m1.780s
user 0m0.000s
sys 0m0.012s

Files

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replay.100G.slow.bin (19.5 KB) replay.100G.slow.bin		Vaibhav Bhembre, 07/17/2016 12:29 AM
replay.100G.fast.bin (19.5 KB) replay.100G.fast.bin		Vaibhav Bhembre, 07/17/2016 12:29 AM
lttng_trace_10G_objectmap_disabled_fast.tar.gz (16 KB) lttng_trace_10G_objectmap_disabled_fast.tar.gz		Vaibhav Bhembre, 07/18/2016 02:38 PM
lttng_trace_10G_objectmap_enabled_slow.tar.gz (14.2 KB) lttng_trace_10G_objectmap_enabled_slow.tar.gz		Vaibhav Bhembre, 07/18/2016 02:38 PM

Related issues 1 (0 open — 1 closed)

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Updated by Vaibhav Bhembre almost 8 years ago

File replay.100G.fast.bin replay.100G.fast.bin added
File replay.100G.slow.bin replay.100G.slow.bin added

I am attaching 2 files for lttng trace run captured while running: mkfs.xfs -s size=4096 -f /dev/sda.

replay.100G.slow.bin - trace with object-map enabled.
replay.100G.fast.bin - trace with object-map disabled.

Other images features that were common across both runs: layering, striping, exclusive-lock, deep-flatten.

size: 102400 MB in 25600 objects
order: 22 (4096 kB objects)
format: 2
flags:
stripe unit: 4096 kB
stripe count: 1

Let me know if I can provide anything else. Thanks.

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Updated by Vaibhav Bhembre over 7 years ago

File lttng_trace_10G_objectmap_enabled_slow.tar.gz lttng_trace_10G_objectmap_enabled_slow.tar.gz added
File lttng_trace_10G_objectmap_disabled_fast.tar.gz lttng_trace_10G_objectmap_disabled_fast.tar.gz added

Attaching the raw lttng files for librbd runs. The new image is 10G instead of the 100G in the previous case, but all other attributes should match up.

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