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From: "J. Bruce Fields" <>
Cc: "J. Bruce Fields" <>
Subject: [PATCH 0/2] tweak knfsd session slot table sizing
Date: Mon, 25 Sep 2017 09:21:42 -0400
Message-ID: <> (raw)

From: "J. Bruce Fields" <>

Current client and server defaults can limit NFSv4.1+ mounts to as few
as 4 per gigabytes of server RAM, and people have been running into the
limit on upgrading the protocol version from 4.0 to 4.1.

Bump the limit.  Also return smaller ca_maxrequests as the limit
approaches instead of waiting till we have to fail CREATE_SESSION

A few years ago Trond also posted some patches to dynamically resize
existing sessions as limits approach--I'll revisit those at some point

The numbers chosen here are honestly still a little arbitrary, and we
may tweak them again if we see more problems.


J. Bruce Fields (2):
  nfsd: increase DRC cache limit
  nfsd: give out fewer session slots as limit approaches

 fs/nfsd/nfs4state.c | 5 +++++
 fs/nfsd/nfssvc.c    | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)


             reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-25 13:21 J. Bruce Fields [this message]
2017-09-25 13:21 ` [PATCH 1/2] nfsd: increase DRC cache limit J. Bruce Fields
2017-09-25 13:21 ` [PATCH 2/2] nfsd: give out fewer session slots as limit approaches J. Bruce Fields
2019-09-19  1:08   ` NeilBrown
2019-09-19 16:22     ` J. Bruce Fields
2019-09-19 17:17       ` J. Bruce Fields
2019-09-19 18:41         ` bfields
2019-09-20  6:15           ` [PATCH 1/2] nfsd: handle drc over-allocation gracefully NeilBrown
2019-09-20  6:33             ` [PATCH 1/2 - vers2] " NeilBrown
2019-09-20  6:36               ` [PATCH - 2/2] nfsd: degraded slot-count more gracefully as allocation nears exhaustion NeilBrown
2019-09-20 16:28               ` [PATCH 1/2 - vers2] nfsd: handle drc over-allocation gracefully J. Bruce Fields

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