On May 10, 2013, at 9:27 AM, Arne Jansen <sensille@xxxxxxx> wrote:
> On 09.05.2013 17:14, Remco Hosman - Yerf IT wrote:
>> kernel: 3.9.0
>> btrfs-progs: pulled from git this morning
>>
>> Trying to receive a 5gig send file. the first bit is fast, doing 10 - 50MB/sec.
>> then it slows down. cpu usage is 50% (dual core machine).
>> when i do a strace, it looks like this, repeating over an over, about 1 piece each second:
>> --
>> read(3, "q\0\0\0\20\0008\352\327o", 10) = 10
>> read(3, "\22\0\10\0\0\0$~\0\0\0\0\30\0\10\0\0\0\2\0\0\0\0\0\17\0\24\0DB2/"..., 113) = 113
>> open("/media/snaps/yerf-2013-05-02-03:15:01/DB2/DB2-flat.vmdk", O_RDONLY|O_NOATIME) = 6
>> ioctl(5, 0x4020940d, 0x7fffc6d41c60) = 0
>> close(6) = 0
>> read(3, "q\0\0\0\20\0\242>\357\263", 10) = 10
>> read(3, "\22\0\10\0\0\0&~\0\0\0\0\30\0\10\0\0\0\2\0\0\0\0\0\17\0\24\0DB2/"..., 113) = 113
>> open("/media/snaps/yerf-2013-05-02-03:15:01/DB2/DB2-flat.vmdk", O_RDONLY|O_NOATIME) = 6
>> ioctl(5, 0x4020940d, 0x7fffc6d41c60) = 0
>> close(6) = 0
>> --
>>
>
> Is this the receive side?
> Where does the data come from, a local file or via network?
>
Yes, this is the receiving side. data comes from a local file.
sometimes it does hit a 'good' portion, then i get a strafe like this:
read(3, "(\300\0\0\17\0N0\346\307", 10) = 10
read(3, "\17\0\24\0DB2/DB2-flat.vmdk.ok\22\0\10\0\0@\25\325"..., 49192) = 49192
pwrite(5,"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,49152,3574939648) = 49152
Managed to find what ioctl 0x4020940d is in the meantime: BTRFS_IOC_CLONE_RANGE, with 32 bytes parameters (4x int64). have not managed to get the parameters yet. i have no idea how to work gbd.
but i guess they are coming from the 113 bytes it is reading.
Remco
> -Arne
>
>> it pauses for a second after "ioctl(5, 0x4020940d"
>> it has been running like that for 3 hours now.
>> the file its working is large (80gig) and filefrag reports 648862 extends.
>> filesystem is mounted with rw,relatime,compress-force=lzo,space_cache
>>
>> anything i can do to see what the problem is?
>>
>> Remco--
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