Hello Greg,
Can you please consider including the following patches in the stable linux-4.14.y branch?
An NFS server accepts only a limited number of concurrent v4.1+ mounts. Once that limit is reached, on the affected client side, mount.nfs appears to hang to keep reissuing CREATE_SESSION calls until one of them succeeds. This is to bump the limit, also return smaller ca_maxrequests as the limit approaches instead of waiting till we have to fail CREATE_SESSION completely.
44d8660d3bb0("nfsd: increase DRC cache limit") de766e570413("nfsd: give out fewer session slots as limit approaches") c54f24e338ed("nfsd: fix performance-limiting session calculation")
Thanks, Qian Lu
On Fri, Jul 26, 2019 at 02:36:35PM -0700, Qian Lu wrote:
Hello Greg,
Can you please consider including the following patches in the stable linux-4.14.y branch?
An NFS server accepts only a limited number of concurrent v4.1+ mounts. Once that limit is reached, on the affected client side, mount.nfs appears to hang to keep reissuing CREATE_SESSION calls until one of them succeeds. This is to bump the limit, also return smaller ca_maxrequests as the limit approaches instead of waiting till we have to fail CREATE_SESSION completely.
44d8660d3bb0("nfsd: increase DRC cache limit") de766e570413("nfsd: give out fewer session slots as limit approaches") c54f24e338ed("nfsd: fix performance-limiting session calculation")
I've queued these 3 for 4.14 and older.
Note that c54f24e338ed has a fix: 3b2d4dcf71c4a ("nfsd: Fix overflow causing non-working mounts on 1 TB machines") which was queued as well.
-- Thanks, Sasha
On Sun, Jul 28, 2019 at 11:04:25AM -0400, Sasha Levin wrote:
On Fri, Jul 26, 2019 at 02:36:35PM -0700, Qian Lu wrote:
Hello Greg,
Can you please consider including the following patches in the stable linux-4.14.y branch?
An NFS server accepts only a limited number of concurrent v4.1+ mounts. Once that limit is reached, on the affected client side, mount.nfs appears to hang to keep reissuing CREATE_SESSION calls until one of them succeeds. This is to bump the limit, also return smaller ca_maxrequests as the limit approaches instead of waiting till we have to fail CREATE_SESSION completely.
44d8660d3bb0("nfsd: increase DRC cache limit") de766e570413("nfsd: give out fewer session slots as limit approaches") c54f24e338ed("nfsd: fix performance-limiting session calculation")
I've queued these 3 for 4.14 and older.
Note that c54f24e338ed has a fix: 3b2d4dcf71c4a ("nfsd: Fix overflow causing non-working mounts on 1 TB machines") which was queued as well.
Thanks for catching that. These sound like reasonable stable backports.
--b.
linux-stable-mirror@lists.linaro.org
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J. Bruce Fields -
Qian Lu -
Sasha Levin