strange things about swap on NFS

strange things about swap on NFS

[FCG WANG Baohua]

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Dear all:
  I use ELDK 3.1.1, kernel 2.4.25 on my HD860 board,  using NFS.  I add a "ext2.img" as mentioned in the ELDK doc.
  But I found that the "dd if=/dev/zero of=swapfile bs=1M count=62" is not easy to executed:
  The system is often no response after execute this command. On several time, it add swap successfully.
   But  when I start to compile package. The system then no response !!
  
   How to slove the problem? Is the reason of my hard disk? I think not, 
   thanks!
 

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Re: strange things about swap on NFS

[Wolfgang Denk]

In message <A9DE2BAF233E444FA9C5E77A5825A01E86505F@ydmail.sbell.com.cn> you wrote:
> 
>   But I found that the "dd if=/dev/zero of=swapfile bs=1M
> count=62" is not easy to executed:

This command alone should just work fine.

>   The system is often no response after execute this command. On several
> time, it add swap successfully.
>    But  when I start to compile package. The system then no response !!

>From your subject and this description I understand that you then try
to use this file as swapfile over NFS, and this causes problems.

There is a known problem with swap over NFS, at least for 2.4 kernels.

>    How to slove the problem? Is the reason of my hard disk? I think not,

RTFM. A solution is described in detail at
http://www.denx.de/twiki/bin/view/DULG/SwappingOverNFS

Note that this is terribly slow, though - but sometimes  it's  better
to  have  a slow and working system than one which is fast and out of
memory.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
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