NFSv3 client caches dozens or hundreds of megabytes before sending a write request to NFS server.

NFSv3 client caches dozens or hundreds of megabytes before sending a write request to NFS server.

[crocket]

Let me explain my network configuration.

Internet <--------------------> eth0 | the linux router | eth1
<------------------------------> eth0 | the desktop.

The linux router is actually a proper computer but not a router that
has linux firmware.
eth1 on the router and eth0 on the desktop are both full-duplex at 100Mbps.
The full-duplex connection is confirmed using netcat like
http://imagebin.org/148650
And they also remain full-duplex during NFS transfers according to "ethtool".

The router runs an NFS server, and the desktop uses an NFS client.

On the desktop, if I download files from the internet to the NFS
server, the client caches dozens or hundreds of megabytes before
sending data to the server like http://imagebin.org/148648
As a result, the download pauses frequently to send data to the NFS
server until the download is finished.
I want NFS client to forward downloaded data to the server immediately
instead of after caching.
In other words, I want NFS transfer to be http://imagebin.org/148650
but not http://imagebin.org/148648

Does anybody know how to solve this issue?

Re: NFSv3 client caches dozens or hundreds of megabytes before sending a write request to NFS server.

[crocket]

It seems "noac" mount option enables direct write to the NFS server.
Now the NFS client doesn't cache but write directly to the server.
Please refer to "man nfs" if you use linux.

On Sun, Apr 17, 2011 at 6:23 PM, crocket <crockabiscuit@gmail.com> wrote:
> Let me explain my network configuration.
>
> Internet <--------------------> eth0 | the linux router | eth1
> <------------------------------> eth0 | the desktop.
>
> The linux router is actually a proper computer but not a router that
> has linux firmware.
> eth1 on the router and eth0 on the desktop are both full-duplex at 100Mbps.
> The full-duplex connection is confirmed using netcat like
> http://imagebin.org/148650
> And they also remain full-duplex during NFS transfers according to "ethtool".
>
> The router runs an NFS server, and the desktop uses an NFS client.
>
> On the desktop, if I download files from the internet to the NFS
> server, the client caches dozens or hundreds of megabytes before
> sending data to the server like http://imagebin.org/148648
> As a result, the download pauses frequently to send data to the NFS
> server until the download is finished.
> I want NFS client to forward downloaded data to the server immediately
> instead of after caching.
> In other words, I want NFS transfer to be http://imagebin.org/148650
> but not http://imagebin.org/148648
>
> Does anybody know how to solve this issue?
>