more on my problem ...
* it seems that when using tcp mount the hang appears more often and =
more
quickly !
* on stock 2.4.19 which I have is a limited perf but it works
* on 2.4.19 + nfs patches I have limited perf + hang !
I said I have limited perf because the NetApp filer I use as server is =
a 880
which is given for more than 15000 nfs/ops and with my Linux box I =
can't do
more than 2/3000 ops when I am the only client !
how can I track this down ?
valery
> -----Original Message-----
> From: Brasseur Val=E9ry [mailto:[email protected]]
> Sent: Wednesday, August 14, 2002 6:22 PM
> To: 'Trond Myklebust'
> Cc: 'Lever, Charles'; [email protected]
> Subject: RE: [NFS] 2.4.19 hang (was unlink perf pb !)
>=20
>=20
>=20
> well I try ! but for now :
> * all I have is a console message saying "RPC: waiting for=20
> request slot"
> * when I turn debug on : system slow to a crawl ! load=20
> 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 !
>=20
> I'v tried to but debug just when system near crash, but then=20
> it slow down,
> and get back to "life" slowly.
>=20
> more : I have some difficulties to reproduce what i was=20
> having yesterday !
>=20
> valery
>=20
> > -----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=20
> <[email protected]> writes:
> >=20
> > > try a stock 2.4.19 without nfs patches : no hang ! =20
> 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
>=20
>=20
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>=20
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>>>>> " " == Brasseur Val?ry <[email protected]> writes:
> more on my problem ...
> * it seems that when using tcp mount the hang appears more
> often and more
> quickly !
> * on stock 2.4.19 which I have is a limited perf but it works
> * on 2.4.19 + nfs patches I have limited perf + hang !
> I said I have limited perf because the NetApp filer I use as
> server is a 880 which is given for more than 15000 nfs/ops and
> with my Linux box I can't do more than 2/3000 ops when I am the
> only client !
> how can I track this down ?
Unless you are using some form of NAT (a.k.a. masquerading) it sounds
rather like you have some serious networking problems. Certainly I
have never heard of anybody having problems with hangs on both UDP
*and* TCP mounts - the latter in particular was designed to work
around network congestion problems.
Have you therefore tried things like swapping out the networking card
for another (preferably of a different make and different Linux
driver), and ditto for any switches/HUBs?
Cheers,
Trond
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