On Mon, Aug 09, 2010 at 10:56:46PM +0530, Nitin Gupta wrote: > The zram module creates RAM based block devices named /dev/zram<id> > (<id> = 0, 1, ...). Pages written to these disks are compressed and stored > in memory itself. > > One of the major changes done is the replacement of ioctls with sysfs > interface. One of the advantages of this approach is we no longer depend on the > userspace tool (rzscontrol) which was used to set various parameters and check > statistics. Maintaining updated version of rzscontrol as changes were done to > ioctls, statistics exported etc. was a major pain. > > Another significant change is the introduction of percpu stats and compression > buffers. Earlier, we had per-device buffers protected by a mutex. This was a > major bottleneck on multi-core systems. With these changes, benchmarks with > fio[1] showed a speedup of about 20% for write performance on dual-core > system (see patch 4/10 description for details). > > > For easier testing, a single patch against 2.6.35-git8 has been uploaded at: > http://compcache.googlecode.com/hg/sub-projects/mainline/zram_2.6.36-rc0.patch I applied the first 2 and last 2 of these patches and they will show up in the linux-next tree tomorrow. I stopped there due to Andrew's complaints about the per-cpu variable stuff. Please resolve this and redo the patch set and I will be glad to apply them. thanks, greg k-h -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>