On Friday 13 May 2011 18:53:58 you wrote:
> On Thu, 12 May 2011, Fyodor Ustinov wrote:
> > Hi!
> >
> > Like previous, but ceph fs instead of rbd.
> > (i.e. iozone with 4G file).
> >
> > [ 783.295035] ceph: loaded (mds proto 32)
> > [ 783.300122] libceph: client4125 fsid
> > ff352dfd-078c-e65f-a769-d25abb384d92 [ 783.300642] libceph: mon0
> > 77.120.112.193:6789 session established [ 941.278185] libceph: msg_new
> > can't create type 0 front 4096
> > [ 941.278456] libceph: msgpool osd_op alloc failed
> > [ 941.278539] libceph: msg_new can't create type 0 front 512
> > [ 941.278606] libceph: msgpool osd_op_reply alloc failed
> > [ 941.278670] libceph: msg_new can't create type 0 front 4096
> > [ 941.278737] libceph: msgpool osd_op alloc failed
> > [ 941.278808] libceph: msg_new can't create type 0 front 512
> > [ 941.278875] libceph: msgpool osd_op_reply alloc failed
> > [ 941.279011] libceph: msg_new can't create type 0 front 4096
> > [ 941.279079] libceph: msgpool osd_op alloc failed
> > [ 941.279153] libceph: msg_new can't create type 0 front 512
> > [ 941.279220] libceph: msgpool osd_op_reply alloc failed
> > [ 941.279286] libceph: msg_new can't create type 0 front 4096
> > [ 941.279352] libceph: msgpool osd_op alloc failed
> > [ 941.279422] libceph: msg_new can't create type 0 front 512
> > [ 941.279623] libceph: msgpool osd_op_reply alloc failed
> > [ 941.279692] libceph: msg_new can't create type 0 front 4096
> > [ 941.279897] libceph: msgpool osd_op alloc failed
> > [ 941.280042] libceph: msg_new can't create type 0 front 512
> > [ 941.280300] libceph: msgpool osd_op_reply alloc failed
> > [ 941.280418] libceph: msg_new can't create type 0 front 4096
> > [ 941.280534] libceph: msgpool osd_op alloc failed
> > [ 941.280793] libceph: msg_new can't create type 0 front 512
> > [ 941.280958] libceph: msgpool osd_op_reply alloc failed
> > [ 941.281074] libceph: msg_new can't create type 0 front 4096
> > [ 941.281236] libceph: msgpool osd_op alloc failed
>
> The ceph memory allocations are definitely not bulletproof and low memory
> situations can still cause problems.
Lack of memory is not the worst. The worst thing is that after some time the
server crashed with a Kernel panic.
> I'm not sure that that is what is
> going on here, but you might try adjusting vm.min_free_kbytes and see if
> that has an effect. e.g.,
>
> sysctl -w vm.min_free_kbytes=262144
Old value - vm.min_free_kbytes = 5752
Seem to be helped. But 260M "minimum free" - looks scary. :)
WBR,
Fyodor.
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