Bug#702477: marked as done (nfs-common: client-side directory walk performance degradaton)
Your message dated Sat, 24 Apr 2021 08:00:54 -0700 (PDT)
with message-id <608432a6.1c69fb81.73fb8.904b@mx.google.com>
and subject line Closing this bug (BTS maintenance for src:linux bugs)
has caused the Debian Bug report #702477,
regarding nfs-common: client-side directory walk performance degradaton
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
702477: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=702477
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message ---
- To: submit@bugs.debian.org
- Subject: nfs-common: client-side directory walk performance degradaton
- From: Dmitry Smirnov <onlyjob@member.fsf.org>
- Date: Thu, 7 Mar 2013 12:12:08 +1100
- Message-id: <201303071212.08891.onlyjob@member.fsf.org>
Package: nfs-common
Version: 1:1.2.6-3
Severity: normal
I believe there is performance degradation in NFS4 client:
sudo mount -t nfs4 debmain:/tmp /mnt/tmp
/usr/bin/time -p sh -c 'tree /mnt/tmp | tail -1'
287 directories, 63315 files
real 4.22
user 1.32
sys 1.04
When
/usr/bin/time -p sh -c 'tree /mnt/tmp | tail -1'
is repeated several seconds later the output is this:
287 directories, 63315 files
real 24.64
user 1.58
sys 3.42
I tracked it down to "acregmin" NFS mount option: when "acregmin" is
over/expired directory walk becomes ~5 times slower in my case.
Setting "acregmin=120" on mount will delay the problem for exactly 120
seconds: `tree` will walk directory structure in less than 4 seconds within 2
minutes after first walk, then 120 seconds later it slows down to >24 seconds
needed to walk the same tree again.
Setting "acregmin=0" makes directory walk time >24 seconds even for the first
walk.
Cheers,
Dmitry Smirnov
GPG key : 4096R/53968D1B
--- System information. ---
Architecture: amd64
Kernel: Linux 3.7-trunk-amd64
--- Package information. ---
Depends (Version) | Installed
=========================================-+-===================
libc6 (>= 2.3) | 2.13-38
libcap2 (>= 2.10) | 1:2.22-1.2
libcomerr2 (>= 1.01) | 1.42.5-1
libdevmapper1.02.1 (>= 2:1.02.20) | 2:1.02.74-6
libevent-2.0-5 (>= 2.0.10-stable) | 2.0.19-stable-3
libgssglue1 | 0.4-2
libk5crypto3 (>= 1.6.dfsg.2) | 1.10.1+dfsg-4
libkeyutils1 | 1.5.5-3
libkrb5-3 (>= 1.6.dfsg.2) | 1.10.1+dfsg-4
libmount1 (>= 2.19.1) | 2.20.1-5.3
libnfsidmap2 | 0.25-4
libtirpc1 | 0.2.2-5
libwrap0 (>= 7.6-4~) | 7.6.q-24
rpcbind | 0.2.0-8
adduser | 3.113+nmu3
ucf | 3.0025+nmu3
lsb-base (>= 1.3-9ubuntu3) | 4.1+Debian8
initscripts (>= 2.88dsf-13.3) | 2.88dsf-41
libblkid1 (>= 2.16) | 2.20.1-5.3
libc6 (>= 2.3) | 2.13-38
libtirpc1 | 0.2.2-5
libwrap0 (>= 7.6-4~) | 7.6.q-24
nfs-common (= 1:1.2.6-3) | 1:1.2.6-3
ucf | 3.0025+nmu3
lsb-base (>= 1.3-9ubuntu3) | 4.1+Debian8
Recommends (Version) | Installed
=========================-+-===========
python | 2.7.3-4
Suggests (Version) | Installed
=========================-+-===========
open-iscsi |
watchdog |
-- /etc/default/nfs-common --
NEED_STATD=no
STATDOPTS=
NEED_IDMAPD=yes
NEED_GSSD=
-- /etc/idmapd.conf --
[General]
Verbosity = 0
Pipefs-Directory = /var/lib/nfs/rpc_pipefs
Domain = local
[Mapping]
Nobody-User = nobody
Nobody-Group = nogroup
-- /etc/fstab --
--- End Message ---
--- Begin Message ---
Hi
This bug was filed for a very old kernel or the bug is old itself
without resolution.
If you can reproduce it with
- the current version in unstable/testing
- the latest kernel from backports
please reopen the bug, see https://www.debian.org/Bugs/server-control
for details.
Regards,
Salvatore
--- End Message ---
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