Сейчас так модно поговорить об ЭТОМ, не могу не внести свою лепту путём создания темки на уютненьком ЛОРчане.
Исходный вброс: http://lkml.org/lkml/2010/10/26/155
How do I notice slowdowns ? The JuK lags so badly that it can't play any music, VBox running XP usually trashes the disk, the mouse pointer freezes, kwin effects freeze for few seconds. How can I make it much worse ? I can try & run disk clean up under XP that is running in VBox, with folder compression. On top of it if I start copying big files in linux ( 700MB avis, etc ), GUI effects freeze, mouse pointer freezes for few seconds sometimes.
http://lkml.org/lkml/2010/10/28/123
«Many seconds freezes» and slowdowns wont be fixed via the VFS scalability patches i'm afraid.
This has the appearance of some really bad IO or VM latency problem. Unfixed and
present in stable kernel versions going from years ago all the way to v2.6.36.
Thanks,
Ingo
А тут уже нотки неадеквата: http://lkml.org/lkml/2010/10/28/133
>> Do you still see high latencies in vfs_lseek() and vfs_fsync()? I'm not a VFS
expert but looking at your latencytop output, it seems that fsync grabs
->i_mutex which blocks vfs_llseek(), for example. I'm not sure why that causes
high latencies though it's a mutex we're holding.
> It does. But what workload does a lot of llseeks while fsyncing the same file?
I'd bet some application is doing really stupid things here.
Дискасс :D
