Comment 635 for bug 620074

On 3.9-rc5 have a pretty good result with copying from usb-flash to hdd. High speed(30+ mb/s) and iowait 2-20%, wery well. hdd -> flash have 50-60% iowait, but no have any performance problems. Copying speed 12-16mb/s(that is maximum for my usb-flash).

dd if=/dev/zero of=~/ololo bs=1M count=1024 provides high iowait and have some performance problems(in 3d apps have small freezes, fps ceases unstable, and DE slowing down; ie, tasks are starving?).

One a very important problem - swap. Even with a small content of swap have a problems with smoothly work. When kernel starting an a very high usage of swap freezes are delayed on minutes, all of have - freezes. It feels like mm-manager work with swap in blocking mode %) Multitasking is locking when page merging ram <-> swap? Have any ideas why that happens?

Oy, forgot, my sata controller is MCP67(most buggy chip?).