after some more investigation on my D state hang here is some observations :
* I couldn't get a clear trace of state : sysrq-t was not dump on a file !
don't know why !
so I hand wrote extract of what I see and let ksymsoops try !
got this : processes was in kmap or in flush_tbl !
* now after a clean boot, lauchn my prog : after a few second the LA grow,
blocked processes grow too ! (in my vmstat all the processes are in block
queue !) and only 1 waiting process !
when in this state, I can't do many things as all what I can do seems to
hang too !
=> I was not having this probleme in 2.4.18 !
note : when this arrive I've got something like 10 to 20 Mbs to nfs server.
valery
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if your client works OK with 2.4.18 but stops with your 2.4.19+nfs
kernels, can you try hunting down exactly which kernel causes the
problem? does 2.4.19 without any nfs patches work, for example?
> after some more investigation on my D state hang here is some
> observations :
>
> * I couldn't get a clear trace of state : sysrq-t was not
> dump on a file !
> don't know why !
> so I hand wrote extract of what I see and let ksymsoops try !
>
> got this : processes was in kmap or in flush_tbl !
>
> * now after a clean boot, lauchn my prog : after a few second
> the LA grow,
> blocked processes grow too ! (in my vmstat all the processes
> are in block
> queue !) and only 1 waiting process !
>
> when in this state, I can't do many things as all what I
> can do seems to
> hang too !
>
> => I was not having this probleme in 2.4.18 !
>
> note : when this arrive I've got something like 10 to 20 Mbs
> to nfs server.
>
>
> valery
>
>
>
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try a stock 2.4.19 without nfs patches : no hang !
seems that nfs patches broke something !
valery
> -----Original Message-----
> From: Lever, Charles [mailto:[email protected]]
> Sent: Tuesday, August 13, 2002 8:42 PM
> To: 'Brasseur Val=E9ry'
> Cc: [email protected]
> Subject: RE: [NFS] 2.4.19 hang (was unlink perf pb !)
>=20
>=20
> if your client works OK with 2.4.18 but stops with your 2.4.19+nfs
> kernels, can you try hunting down exactly which kernel causes the
> problem? does 2.4.19 without any nfs patches work, for example?
>=20
> > after some more investigation on my D state hang here is some=20
> > observations :
> >=20
> > * I couldn't get a clear trace of state : sysrq-t was not=20
> > dump on a file !
> > don't know why !
> > so I hand wrote extract of what I see and let ksymsoops try !
> > =20
> > got this : processes was in kmap or in flush_tbl !
> >=20
> > * now after a clean boot, lauchn my prog : after a few second=20
> > the LA grow,
> > blocked processes grow too ! (in my vmstat all the processes=20
> > are in block
> > queue !) and only 1 waiting process !
> >=20
> > when in this state, I can't do many things as all what I=20
> > can do seems to
> > hang too !
> >=20
> > =3D> I was not having this probleme in 2.4.18 !
> >=20
> > note : when this arrive I've got something like 10 to 20 Mbs=20
> > to nfs server.
> >=20
> >=20
> > valery
> >=20
> >=20
> >=20
> > -------------------------------------------------------
> > This sf.net email is sponsored by: Dice - The leading=20
> online job board
> > for high-tech professionals. Search and apply for tech jobs today!
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> > _______________________________________________
> > NFS maillist - [email protected]
> > https://lists.sourceforge.net/lists/listinfo/nfs
> >=20
>=20
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>>>>> " " =3D=3D Brasseur Val=E9ry <[email protected]> writes:
> try a stock 2.4.19 without nfs patches : no hang ! seems that
> nfs patches broke something !
Can you get me a trace of the hang using the command
echo "1" > /proc/sys/sunrpc/rpc_debug
Cheers,
Trond
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well I try ! but for now :
* all I have is a console message saying "RPC: waiting for request =
slot"
* when I turn debug on : system slow to a crawl ! load average goes to =
more
than 700 ! but it works
never crash !
* when I turn debug of : crash with lot's of process blocked ! running
process seems to be kswapd !
I'v tried to but debug just when system near crash, but then it slow =
down,
and get back to "life" slowly.
more : I have some difficulties to reproduce what i was having =
yesterday !
valery
> -----Original Message-----
> From: Trond Myklebust [mailto:[email protected]]
> Sent: Wednesday, August 14, 2002 2:53 PM
> To: Brasseur Val=E9ry
> Cc: 'Lever, Charles'; [email protected]
> Subject: Re: [NFS] 2.4.19 hang (was unlink perf pb !)
>=20
>=20
> >>>>> " " =3D=3D Brasseur Val=E9ry <[email protected]> =
writes:
>=20
> > try a stock 2.4.19 without nfs patches : no hang ! seems that
> > nfs patches broke something !
>=20
> Can you get me a trace of the hang using the command
>=20
> echo "1" > /proc/sys/sunrpc/rpc_debug
>=20
> Cheers,
> Trond
>=20
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