search for: writeback_single_inode

...extent_bit+0x9e1/0xc86 extent_clear_unlock_delalloc+0x8c/0x1d8 cow_file_range+0x1356/0x1432 run_delalloc_range+0x263/0x1702 __extent_writepage+0x2c4/0x15a8 extent_write_cache_pages.clone.0+0x211/0x33d extent_writepages+0x243/0x260 btrfs_writepages+0x87/0x92 do_writepages+0x1c/0x25 writeback_single_inode+0xe2/0x24c writeback_inodes_wb+0x374/0x48d wb_writeback+0x121/0x1f6 wb_do_writeback+0x147/0x159 bdi_writeback_task+0x3a/0xaa bdi_start_fn+0x63/0xc7 kthread+0x7a/0x82 kernel_thread_helper+0x4/0x10 The write to delalloc_bytes in the function btrfs_clear_bit_hook is protected by the sp...

...f54>] ? end_buffer_async_write+0x0/0x13b [163440.614990] [<ffffffff810bb3a2>] ? __writepage+0xa/0x25 [163440.614996] [<ffffffff810bba29>] ? write_cache_pages+0x20b/0x327 [163440.615001] [<ffffffff810bb398>] ? __writepage+0x0/0x25 [163440.615008] [<ffffffff81108b56>] ? writeback_single_inode+0xe7/0x2da [163440.615014] [<ffffffff8110985c>] ? writeback_inodes_wb+0x424/0x4ff [163440.615019] [<ffffffff81109a63>] ? wb_writeback+0x12c/0x1ab [163440.615025] [<ffffffff8100ecdf>] ? xen_restore_fl_direct_end+0x0/0x1 [163440.615031] [<ffffffff81109bfd>] ? wb_do_writeba...

...0/0x74f [btrfs] Jul 8 11:49:40 xback2 kernel: [74920.681032] [<ffffffffa041ade3>] btrfs_writepages+0x28/0x2a [btrfs] Jul 8 11:49:40 xback2 kernel: [74920.681032] [<ffffffff810e05d5>] do_writepages+0x21/0x2a Jul 8 11:49:40 xback2 kernel: [74920.681032] [<ffffffff8113e386>] writeback_single_inode+0x96/0x194 Jul 8 11:49:40 xback2 kernel: [74920.681032] [<ffffffff8113e6db>] writeback_sb_inodes+0xa1/0x12b Jul 8 11:49:40 xback2 kernel: [74920.681032] [<ffffffff8113f4f0>] writeback_inodes_wb+0x163/0x175 Jul 8 11:49:40 xback2 kernel: [74920.681032] [<ffffffff8113f741>]...

I suspect this might be related to previous btrfs errors I''ve had on the same filesystem. See: http://python.ca/nas/linux/btrfs_bug.txt The most recent kernel message is: WARNING: at fs/btrfs/extent-tree.c:8239 btrfs_free_block_groups+0x218/0x275() Hardware name: MS-7388 Modules linked in: udf crc_itu_t isofs loop nls_iso8859_1 vboxnetflt vboxdrv nls_utf8 nls_cp437

...ithrandir kernel: [ 620.107657] SysRq : Emergency Sync Jun 11 10:59:38 mithrandir kernel: [ 620.523102] SysRq : Emergency Sync Jun 11 10:59:38 mithrandir kernel: [ 620.646745] ------------[ cut here ]------------ Jun 11 10:59:38 mithrandir kernel: [ 620.646753] WARNING: at fs/fs-writeback.c:356 writeback_single_inode+0x60/0x1c5() Jun 11 10:59:38 mithrandir kernel: [ 620.646755] Hardware name: VGN-Z11VN_B Jun 11 10:59:38 mithrandir kernel: [ 620.646756] Modules linked in: rfcomm bnep snd_hrtimer vboxnetadp vboxnetflt vboxdrv binfmt_misc dm_crypt dm_mod hso isofs btrfs zlib_deflate crc32c libcrc32c vfat fat fus...

...c40>] ? jbd2_journal_start+0xa1/0xcd [<ffffffff8119957f>] ? ext4_journal_start_sb+0xdc/0x111 [<ffffffff81186852>] ? ext4_meta_trans_blocks+0x74/0xce [<ffffffff8118bc42>] ext4_da_writepages+0x47a/0x6a7 [<ffffffff810d8a00>] do_writepages+0x21/0x2a [<ffffffff8112cdb8>] writeback_single_inode+0xc8/0x1e3 [<ffffffff8112d5e4>] writeback_inodes_wb+0x30b/0x37e [<ffffffff8102f82d>] ? paravirt_end_context_switch+0x17/0x31 [<ffffffff8100b459>] ? xen_end_context_switch+0x1e/0x22 [<ffffffff8112d788>] wb_writeback+0x131/0x1bb [<ffffffff81064029>] ? try_to_del_timer_sy...

Hi, Recently, I made a btrfs to use. And I met slowness problem. Trying to diag it. I found this: 1. dd if=/dev/zero of=test count=1024 bs=1MB This is fast, at about 25MB/s, and reasonable iowait. 2. dd if=/dev/zero of=test count=1 bs=1GB This is pretty slow, at about 1.5MB/s, and 90%+ iowait, constantly. May I know why it works like this? Thanks. -- To unsubscribe from this list: send the

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