Re: [dm-crypt] PROBLEM: read starvation during writeback

2012-10-13 Thread Michael Zugelder
Hi, I have a small update on my previously posted test case. I noticed 'cryptsetup -c null' uses cipher_null in ecb mode, and in that case, I don't observe any read starvation. I'm not sure what the default cipher mode is (cryptsetup uses cbc-essiv:sha256), but I can reproduce the problem using ju

Re: [dm-crypt] PROBLEM: read starvation during writeback

2012-10-12 Thread Michael Zugelder
Hi, On Fri, 2012-10-12 at 22:34 +0200, Milan Broz wrote: > On 10/12/2012 09:37 PM, Michael Zugelder wrote: > > Testing setup: > > * Fedora 17, stock 3.5.4-2.fc17 kernel and a self-compiled 3.6.1 kernel > > * 320 GiB USB hard drive (sdb) > > I guess that USB is the key factor here... I remember