zfs recv hangs in kmem arena

[Xin Li]

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On 10/16/14 8:43 PM, James R. Van Artsdalen wrote:
> On 10/16/2014 11:12 AM, Xin Li wrote:
>>> On 9/26/2014 1:42 AM, James R. Van Artsdalen wrote:
>>>> FreeBSD BLACKIE.housenet.jrv 10.1-BETA2 FreeBSD 10.1-BETA2
>>>> #2 r272070M: Wed Sep 24 17:36:56 CDT 2014 
>>>> james at BLACKIE.housenet.jrv:/usr/obj/usr/src/sys/GENERIC
>>>> amd64
>>>> 
>>>> With current STABLE10 I am unable to replicate a ZFS pool
>>>> using zfs send/recv without zfs hanging in state "kmem
>>>> arena", within the first 4TB or so (of a 23TB Pool).
> 
>> What does procstat -kk 1176 (or the PID of your 'zfs' process
>> that stuck in that state) say?
>> 
>> Cheers,
>> 
> SUPERTEX:/root# ps -lp 866 UID PID PPID CPU PRI NI   VSZ   RSS
> MWCHAN   STAT TT      TIME COMMAND 0 866  863   0  52  0 66800
> 29716 kmem are D+    1  57:40.82 zfs recv -duvF BIGTOX 
> SUPERTEX:/root# procstat -kk 866 PID    TID COMM             TDNAME
> KSTACK 866 101573 zfs              -                mi_switch+0xe1 
> sleepq_wait+0x3a _cv_wait+0x16d vmem_xalloc+0x568 vmem_alloc+0x3d 
> kmem_malloc+0x33 keg_alloc_slab+0xcd keg_fetch_slab+0x151 
> zone_fetch_slab+0x7e zone_import+0x40 uma_zalloc_arg+0x34e 
> arc_get_data_buf+0x31a arc_buf_alloc+0xaa dmu_buf_will_fill+0x169 
> dmu_write+0xfc dmu_recv_stream+0xd40 zfs_ioc_recv+0x94e 
> zfsdev_ioctl+0x5ca

Do you have any special tuning in your /boot/loader.conf?

Cheers,

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