Am Samstag, 15. Oktober 2011 schrieb Henrique de Moraes Holschuh: > On Sat, 15 Oct 2011, Camaleón wrote: > > On Sat, 15 Oct 2011 12:39:05 +0700, Sthu Deus wrote: > > > > > > > I have terrible delays/freezes w/ any application whenever HDD (a > > > SATA one) does its writing. > > > > > > > > That should not happen at all. > > But it does. The kernel default IO scheduler (CFQ) has serious issues > with "writeback" traffic (dirty memory that needs to get flushed to > disk, be them filesystem buffers/metadata or mmap'd pages, etc). It is > often not that bad, but it can certainly stall things a great deal > with, e.g. ext4+lvm+md combinations (there are others). > > Also, any fsync operation can be very expensive if there are too many > outstanding writes on that filesystem.
There has been significant improvements with recent kernels. After installing 2.6.37 - AFAIR - on my ThinkPad T42 which uses Ext4 I actually thought I bought a new notebook. And there have been improvements after that version as well. So it might be a good idea to install a backport kernel, once its clear the hardware is working to its specifications. Ciao, -- Martin 'Helios' Steigerwald - http://www.Lichtvoll.de GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7 -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/201110151954.15714.mar...@lichtvoll.de
