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Bug#795991: /boot/vmlinuz-3.16.0-0.bpo.4-amd64: duplicate request cache is too small for NFS 4.1 servers

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On Tue, Aug 18, 2015 at 03:30:59PM +0200, Christoph Martin wrote:
> Package: src:linux
> Version: 3.16.7-ckt11-1+deb8u3~bpo70+1
> Severity: normal
> File: /boot/vmlinuz-3.16.0-0.bpo.4-amd64
> 
> The drc (duplicate request cache) for NFS 4.1 in the vanilla kernel
> has a fixed size only depending on the RAM of the machine.
> 
> For example, when setting up a vm which should only serve as a
> nfs referral server with 768 MB RAM it could only server about
> 20 clients. So it is roughly 32 clients per GB.
> 
> The problem is, that in nfssvc.c the size of drc is calculated with
> a shift of NFSD_DRC_SIZE_SHIFT bits from the RAM size.
> 
> I attach a patch for this which I also sent to linux-nfs.
> (See http://www.spinics.net/lists/linux-nfs/msg51791.html)
> 
> It implements a module variable to set the size on module load.
> 
> It hope that such a patch can make it into Debian soon.

is this problem still relevant?

Side note that we would anyway not apply a patch which would not have
been accepted upstream, likely unless there are very valid reasons.

Regards,
Salvatore

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Bug#795991: /boot/vmlinuz-3.16.0-0.bpo.4-amd64: duplicate request cache is too small for NFS 4.1 servers Salvatore Bonaccorso <carnil@debian.org> - 2021-04-30 14:40 +0200
  Bug#795991: /boot/vmlinuz-3.16.0-0.bpo.4-amd64: duplicate request cache is too small for NFS 4.1 servers Christoph Martin <martin@uni-mainz.de> - 2021-04-30 17:50 +0200
    Bug#795991: /boot/vmlinuz-3.16.0-0.bpo.4-amd64: duplicate request cache is too small for NFS 4.1 servers Salvatore Bonaccorso <carnil@debian.org> - 2021-05-01 08:00 +0200
      Bug#795991: /boot/vmlinuz-3.16.0-0.bpo.4-amd64: duplicate request cache is too small for NFS 4.1 servers Christoph Martin <martin@uni-mainz.de> - 2021-05-03 12:00 +0200
  Bug#795991: /boot/vmlinuz-3.16.0-0.bpo.4-amd64: duplicate request cache is too small for NFS 4.1 servers Christoph Martin <martin@uni-mainz.de> - 2021-05-03 11:40 +0200

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