On 05/14/2008 11:33 PM, Alexey Dobriyan wrote:
On Thu, May 15, 2008 at 01:16:00AM +0400, Alexey Dobriyan wrote:
mkfs.ext2 became kick-ass slow:
+ sudo mkfs.ext2 -F
mke2fs 1.40.6 (09-Feb-2008)
Warning: 256-byte inodes not usable on older systems
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
9773056 inodes, 39072726 blocks
1953636 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
1193 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
...
Writing inode tables: 193/1193
^^^^
counter moves slowly,
occasional counting at what seems to be normal
speed occur.
160 GB SATA disk, no partitions.
According to sysfs, CFQ is in use, the rest is compiled out.
2.6.26-rc2 is fine, mkfs takes ~1 min.
Slowdown is totally reproducible.
CONFIG_ATA=y
CONFIG_ATA_ACPI=y
CONFIG_SATA_AHCI=y
CONFIG_ATA_SFF=y
CONFIG_ATA_PIIX=y
CONFIG_PATA_JMICRON=y
/sys/block/sdb/queue/iosched/back_seek_max
16384
/sys/block/sdb/queue/iosched/back_seek_penalty
2
/sys/block/sdb/queue/iosched/fifo_expire_async
250
/sys/block/sdb/queue/iosched/fifo_expire_sync
120
/sys/block/sdb/queue/iosched/quantum
4
/sys/block/sdb/queue/iosched/slice_async
40
/sys/block/sdb/queue/iosched/slice_async_rq
2
/sys/block/sdb/queue/iosched/slice_idle
10
/sys/block/sdb/queue/iosched/slice_sync
100
Here is where it spends time (seems to be always the same):
mkfs.ext2 D 0000000000000000 0 4760 4759
ffff81017ce93a58 0000000000000046 0000000000000000 0000000000000282
ffff81017e14d640 ffffffff8056f4c0 ffff81017e14d880 ffffffff804679a2
00000000ffffb5c4 000000007ce93a68 0000000000000003 ffffffff8023d504
Call Trace:
[<ffffffff804679a2>] ? _spin_unlock_irqrestore+0x42/0x80
[<ffffffff8023d504>] ? __mod_timer+0xc4/0x110
[<ffffffff80465012>] schedule_timeout+0x62/0xe0
[<ffffffff8023cee0>] ? process_timeout+0x0/0x10
[<ffffffff80464ef8>] io_schedule_timeout+0x28/0x40
[<ffffffff8027663a>] congestion_wait+0x8a/0xb0
[<ffffffff80248720>] ? autoremove_wake_function+0x0/0x40
[<ffffffff8026fe31>] balance_dirty_pages_ratelimited_nr+0x1a1/0x3f0
[<ffffffff8026915f>] generic_file_buffered_write+0x1ff/0x740
[<ffffffff80467870>] ? _spin_unlock+0x30/0x60
[<ffffffff802acafb>] ? mnt_drop_write+0x7b/0x160
[<ffffffff80269b30>] __generic_file_aio_write_nolock+0x2a0/0x460
[<ffffffff802548ed>] ? trace_hardirqs_off+0xd/0x10
[<ffffffff80269df7>] generic_file_aio_write_nolock+0x37/0xa0
[<ffffffff80292be1>] do_sync_write+0xf1/0x130
[<ffffffff80256485>] ? trace_hardirqs_on_caller+0xd5/0x160
[<ffffffff80248720>] ? autoremove_wake_function+0x0/0x40
[<ffffffff80256485>] ? trace_hardirqs_on_caller+0xd5/0x160
[<ffffffff8025651d>] ? trace_hardirqs_on+0xd/0x10
[<ffffffff8029339a>] vfs_write+0xaa/0xe0
[<ffffffff80293940>] sys_write+0x50/0x90
[<ffffffff8020b69b>] system_call_after_swapgs+0x7b/0x80
And not only mkfs, ld took ages to link vmlinux.o:
ld D 0000000000000000 0 17340 17339
ffff8100681819c8 0000000000000082 0000000000000000 ffff81006818198c
ffffffff806c90c0 ffff81006b50d2e0 ffffffff80636360 ffff81006b50d558
0000000068181978 0000000100a7523e ffff81006b50d558 0000000100a75269
Call Trace:
[<ffffffff805056b2>] schedule_timeout+0x62/0xd0
[<ffffffff802403b0>] ? process_timeout+0x0/0x10
[<ffffffff805056ad>] ? schedule_timeout+0x5d/0xd0
[<ffffffff80504956>] io_schedule_timeout+0x76/0xd0
[<ffffffff80282cac>] congestion_wait+0x6c/0x90
[<ffffffff8024c2c0>] ? autoremove_wake_function+0x0/0x40
[<ffffffff8027c82f>] balance_dirty_pages_ratelimited_nr+0x13f/0x330
[<ffffffff80275a3d>] generic_file_buffered_write+0x1dd/0x6d0
[<ffffffff8027d0e7>] ? __do_page_cache_readahead+0x167/0x220
[<ffffffff802763ae>] __generic_file_aio_write_nolock+0x25e/0x450
[<ffffffff80276c75>] ? generic_file_aio_read+0x565/0x640
[<ffffffff80276607>] generic_file_aio_write+0x67/0xd0
[<ffffffff802f8bd6>] ext3_file_write+0x26/0xc0
[<ffffffff8029ffa1>] do_sync_write+0xf1/0x140
[<ffffffff8024c2c0>] ? autoremove_wake_function+0x0/0x40
[<ffffffff80289703>] ? remove_vma+0x53/0x70
[<ffffffff80505a01>] ? mutex_lock+0x11/0x30
[<ffffffff802a0a2b>] vfs_write+0xcb/0x190
[<ffffffff802a0be0>] sys_write+0x50/0x90
[<ffffffff8020b82b>] system_call_after_swapgs+0x7b/0x80
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