2011/3/9 Milan Broz <mbroz@xxxxxxxxxx>: >> Could you try to see if you experience a significant performance >> penalty on I/O if you boot the default Debian provided kernel? > > seems my Xorg does not work here, but I just tried it from console: > > # dd if=/dev/notebook/swap of=/dev/null bs=4k > 1024000+0 records in > 1024000+0 records out > 4194304000 bytes (4.2 GB) copied, 40.7913 s, 103 MB/s This test measures how fast one single file can be read. Maybe I forgot to clarify that sequential read of one big file is *not* slow on neither amd64 nor i386 kernels. However, random file access is very slow. A quick way of measuring this is to do a find inside a folder containing a large number of files and subfolders. For example: 'time find /usr | wc -l'. Will you try to see how long the following command takes on your system with both kernels? time find /usr |wc -l Is there any noticable difference? Just to be clear: sequential reads of large files is *not* horribly slow on my 64 bit kernel neither. Here is a test: ~ # dd if=/home/tdn/Download/KNOPPIX_V6.4.4CD-2011-01-30-EN.iso of=/dev/null 1430228+0 records in 1430228+0 records out 732276736 bytes (732 MB) copied, 9,06719 s, 80,8 MB/s Here is my result of the above find-test: ~ $ time find /usr |wc -l find /usr 0,26s user 1,56s system 0% cpu 3:42,68 total wc -l 0,03s user 0,04s system 0% cpu 3:42,68 total PS. I am sorry that my last reply was made directly to you and not the mailing list. This was a mistake. This mail is sent to the mailing list. Med venlig hilsen/Kind regards Thomas Damgaard Nielsen http://thomasdamgaard.dk _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
