yet another observation: yesterday i run all day with the standard 3.11 kernel with all 16GB RAM. At the end of the day i also got in the state where apt-get update took minutes (tens of them). Interestingly, also, the vm.cache_drop trick did not seem to have any speed-up effect on it. Also note that io-activity accoding to iostat was 100% even though it was so ridiculously slow (and no other noticable activity, e.g., according to iotop).
Having finally found an (ugly way) to get nvidia working again i run 3.14 again since yesterday evening. And i do see now the apt-get update anomaly (9 minutes for package read) also on 13.14. During that time according iostat the avgrq-size seemed also to be below 10; avgqu-size fluctuated between 5 and 20 and utilization 20-60%. doing dd measurements as above also was slow (<15MB/s) and this time vm.cache_drop trick did not have any positive impact here, contrary to the experiment reported earlier where a /sbin/sysctl -w vm.drop_caches=2 sped it up to a "normal" 90MB/s. BTW: just in case it is relevant, i use a LUKS encrypted LVM with ext4 FS on the encrypted partitions. ** Tags removed: needs-upstream-testing ** Tags added: kernel-bug-exists-upstream -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1290337 Title: [Lenovo ThinkPad W530] I/O slow down To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1290337/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
