On Saturday, 28 December 2002 04:11, Ken Murchison wrote:
> I didn't see this mentioned in the archives, so I thought I'd share it.
>
> In the process of building a LTSP-based renderfarm for a customer, I had
> to compile my own kernel from the RH 7.3 sources (for reasons that I
> won't get into). As you may or may not now, RedHat has a bunch of their
> own patches to the 2.4.18 kernel, so the Swap-over-NFS NFS patch does
> not apply cleanly. In order to avoid porting the patch to the work with
> the RedHat kernel, and to avoid using any third-party patches at all, I
> started looking for another way to Swap-over-NFS. Here is what I've
> done:
>
> - Compile the kernel for the workstations to include support for loop
> devices (CONFIG_BLK_DEV_LOOP=[y|m])
> - Copy your server's /sbin/losetup to /opt/ltsp/i386/sbin
> - In /opt/ltsp/i386/etc/rc.local, change:
> swapon ${SWAPFILE}
> to:
> /sbin/losetup /dev/loop0 ${SWAPFILE}
> swapon /dev/loop0
>
> The performance of swapping via the loop device might be slower than
> using the kernel patch (I haven't done any comparisons), but since I'm
> only doing this as a last-resort fallback for my render nodes (each has
> 2GB RAM), I'm not really worried about it).
Sounds great. I'm going to try this -- I'm not worried about performance (it
is allowed to be slow(ish)).
I thought the problem with Swap-over-NFS was that it was possible for certain
memory pages to get swapped (like the NFS client), and then you have a
serious problem. Well, this is a potential problem with userland NFS
programs. Can anyone confirm if this was a problem, still is a problem, or
I've just been smoking something?
> After making this change, and using tmpfs instead of a ramdisk for /tmp
> (my render nodes need more than a few MB of temp space), I couldn't be
> happier with LTSP.
>
> Thanks for the great work!
>
> Now if I could only figure out how to get dhclient to exit gracefully so
> /oldmount gets unmounted...
--
Berend De Schouwer
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