very slow IO after resume

[Daniel Lezcano]

Hi All,

I noticed an issue on the IOs after resuming my laptop.

My mailer thunderbird or the compilations are very slow, often blocked 
in 'D' state. The 'top' shows 81% on wait.

The processes stack are always in when blocked:

[<c164f8ab>] balance_dirty_pages.isra.18+0x3f5/0x4b4
[<c112a2ce>] balance_dirty_pages_ratelimited+0xde/0x100
[<c1120d81>] generic_perform_write+0x141/0x1c0
[<c1120e50>] generic_file_buffered_write+0x50/0x80
[<c1122a4a>] __generic_file_aio_write+0x22a/0x490
[<c1122d13>] generic_file_aio_write+0x63/0xd0
[<c11f5162>] ext4_file_write+0xb2/0x100
[<c117318a>] do_sync_write+0x6a/0xa0
[<c1173dc5>] vfs_write+0xa5/0x1d0
[<c1174277>] SyS_write+0x57/0xa0
[<c1661b37>] syscall_call+0x7/0xb

The kernel is 3.11.0-031100-generic based on ubuntu, I noticed this 
issue on some previous version (since 3.5 AFAIR).
My laptop is a Lenovo X230, SSD 250GB (6Gb/s) and 16GB of RAM.

Is it a known issue ?

Thanks
-- Daniel

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