2.6.0-test3-bk10-final regression getting out of hand

2.6.0-test3-bk10-final regression getting out of hand

[Voluspa]

As reported in:
http://marc.theaimsgroup.com/?l=linux-kernel&m=106195494828814&w=2
I'm experiencing a serious NFS regression since 2.6.0-test3-bk10-final
(bk-set determined now). Since that, along the road to 2.6.0-test9,
something has gotten completely out of hand.

cp -a /mnt/oden/etc .

_2.6.0-test3-bk10_
2 minutes

_2.6.0-test3-bk10-final_
3 minutes 47 seconds

_2.6.0-test9_
29 minutes 54 seconds

Nothing has changed in hardware or setup, and the cp tests were done
today. Not being a programmer I tried to delete individual patches in
the bk-set, but couldn't find the exact breakage point.

Erasing changes to:
linux-2.6.0-test3-bk10/fs/nfs/dir.c
No change.

Erasing changes to:
linux-2.6.0-test3-bk10/fs/nfs/nfsroot.c
No change.

Erasing changes to:
linux-2.6.0-test3-bk10/include/linux/sunrpc/timer.h
linux-2.6.0-test3-bk10/net/sunrpc/timer.c
No change.

Erasing changes to:
linux-2.6.0-test3-bk10/net/sunrpc/clnt.c
Doesn't compile.

Erasing changes to:
linux-2.6.0-test3-bk10/include/linux/sunrpc/xprt.h
linux-2.6.0-test3-bk10/net/sunrpc/xprt.c
Doesn't compile.

Using TCP or DIRECTIO in -test9 makes no difference. Here's the
relevant .config-section:

#
# Network File Systems
#
CONFIG_NFS_FS=y
CONFIG_NFS_V3=y
# CONFIG_NFS_V4 is not set
# CONFIG_NFS_DIRECTIO is not set
CONFIG_NFSD=y
CONFIG_NFSD_V3=y
# CONFIG_NFSD_V4 is not set
# CONFIG_NFSD_TCP is not set
CONFIG_LOCKD=y
CONFIG_LOCKD_V4=y
CONFIG_EXPORTFS=y
CONFIG_SUNRPC=y
# CONFIG_SUNRPC_GSS is not set
# CONFIG_SMB_FS is not set
# CONFIG_CIFS is not set
# CONFIG_NCP_FS is not set
# CONFIG_CODA_FS is not set
# CONFIG_INTERMEZZO_FS is not set
# CONFIG_AFS_FS is not set

Mvh
Mats Johannesson


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Re: 2.6.0-test3-bk10-final regression getting out of hand

[Martin Spott]

Voluspa <lista2@comhem.se> wrote:

> I'm experiencing a serious NFS regression since 2.6.0-test3-bk10-final
> (bk-set determined now). Since that, along the road to 2.6.0-test9,
> something has gotten completely out of hand.

I can second the experiences on heavy trouble with 2.6.0-test[8,9] as
NFS _client_ against 2.4.2[1,2] as a server. I didn't have different
servers for testing against but I pretty much _believe_ it's a client
issue.

I only sticked to 'official' 2.6.0-test patches and I'd like to
express, that beginning with 2.6.0-test8 the NFS client is absolutely
unsuable for me. Trying to copy (with 'cp') a file from a local
filesystem to the server over NFS.V2 or .V3 completely freezes _any_
NFS traffic with the same server.
Are there any significant changes to the NFS client I should back out
for the purpose of finding the 'bug' ?

Martin.
-- 
 Unix _IS_ user friendly - it's just selective about who its friends are !
--------------------------------------------------------------------------


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Re: 2.6.0-test3-bk10-final regression getting out of hand

[Trond Myklebust]

>>>>> " " == Martin Spott <Martin.Spott@uni-duisburg.de> writes:

     > completely freezes _any_ NFS traffic with the same server.  Are
     > there any significant changes to the NFS client I should back
     > out for the purpose of finding the 'bug' ?

Err... If you believe it is the client, they I suggest backing out
_all_ client related patches between test7 and test8 for a start...

Personally, I'm starting to suspect some of the IPv4 changes. I'm
seeing wierd crap with the TCP code which suggests some form of memory
corruption. The corruption is occurring on both the client *and*
server side.
The fact that I'm seeing signs of memory poisoning suggests it is
probably an skb being freed too early or something like that.

Cheers,
  Trond


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Re: 2.6.0-test3-bk10-final regression getting out of hand

[Robert Williamson]

I've been seeing NFS client problems as well....for quite sometime.  I too
thought it was the NFS code, however further testing took me to possible
problems with kernel memory code.

For more info on my problems checkout
http://bugme.osdl.org/show_bug.cgi?id=1097

-Robbie

Robert V. Williamson <robbiew@us.ibm.com>
Linux Test Project
IBM Linux Technology Center
Web: http://ltp.sourceforge.net
IRC: #ltp on freenode.irc.net
====================
"Only two things are infinite, the universe and human stupidity, and I'm
not sure about the former." -Albert Einstein


                                                                                                                                        
                      Martin Spott                                                                                                      
                      <Martin.Spott@uni-du        To:       nfs@lists.sourceforge.net                                                   
                      isburg.de>                  cc:                                                                                   
                      Sent by:                    Subject:  Re: [NFS] 2.6.0-test3-bk10-final regression getting out of hand             
                      nfs-admin@lists.sour                                                                                              
                      ceforge.net                                                                                                       
                                                                                                                                        
                                                                                                                                        
                      11/01/2003 10:29 AM                                                                                               
                                                                                                                                        




Voluspa <lista2@comhem.se> wrote:

> I'm experiencing a serious NFS regression since 2.6.0-test3-bk10-final
> (bk-set determined now). Since that, along the road to 2.6.0-test9,
> something has gotten completely out of hand.

I can second the experiences on heavy trouble with 2.6.0-test[8,9] as
NFS _client_ against 2.4.2[1,2] as a server. I didn't have different
servers for testing against but I pretty much _believe_ it's a client
issue.

I only sticked to 'official' 2.6.0-test patches and I'd like to
express, that beginning with 2.6.0-test8 the NFS client is absolutely
unsuable for me. Trying to copy (with 'cp') a file from a local
filesystem to the server over NFS.V2 or .V3 completely freezes _any_
NFS traffic with the same server.
Are there any significant changes to the NFS client I should back out
for the purpose of finding the 'bug' ?

Martin.
--
 Unix _IS_ user friendly - it's just selective about who its friends are !
--------------------------------------------------------------------------


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