>De : Arno Wagner <arno@xxxxxxxxxxx> >À : dm-crypt@xxxxxxxx >Cc : >Envoyé le : Mardi 7 février 2012 9h33 >Objet : Re: Poor performances with nfs and Kernel 3.x > >O.k., no such obervation with 3.2.2 on client and server. I got > >root /gate/tmp>cat ttt | wcs > /dev/null >read: 2.147 GB [ 2147483648 B] avg: 69.274 MB/sec [ 31 sec] > >(wcs, a.k.a. wc-stream is a small tool I wrote to do real-time >monitoring of pipeline throughput and byte count, sources >below.) This is with some ramp-up and almost 100% CPU load >on the (slower) server. > >I noticed though that nfsiostat is not the right tool to measure, as >it gives you performance over the whole time the device has been >mounted, i.e. the throughput number keeps being updated in >real-time. > >Maybe re-run with wcs as shown above (compile instructions are in >the header of wcs.c) and also monitor CPU usage on the server >while this is rrunning, e.g. with "top". I am not saying you >imagine the issue, but lets be sure the measurement is good. > >If you do not want to compile anything, you could also use >something like "time cat ttt > /dev/null" and calculate >throughput manually. > >Arno > >----- CUTed ----- > Hello Arno, Here are the new tests with wcs: results are still the same. /tmp is the tmp directory on the client (7200 rpm HD) /CRYPT is a crypted partition on the server (Green HD ~5600 rpm) /SAV is a non-crypted partition on the server (Green HD ~5600 rpm) CPU monitored with htop *** Server with Kernel 3.0.0-15-server #26 * From client, using NFS on crypted partition: cat /tmp/testfile.avi | wcs > /mnt/CRYPT/testfile.avi read: 2.032 GB [ 2032330895 B] avg: 41.476 MB/sec [ 49 sec] cat /mnt/CRYPT/testfile.avi | wcs > /tmp/testfile.avi read: 2.032 GB [ 2032330895 B] avg: 29.454 MB/sec [ 69 sec] <--------------- ----------- * From client, using NFS on non-crypted partition cat /tmp/testfile.avi | wcs > /mnt/SAV/testfile.avi read: 2.032 GB [ 2032330895 B] avg: 72.583 MB/sec [ 28 sec] cat /mnt/SAV/testfile.avi | wcs > /tmp/testfile.avi read: 2.032 GB [ 2032330895 B] avg: 65.559 MB/sec [ 31 sec] ----------- * From Server: cat /mnt/CRYPT/testfile.avi | wcs > /dev/null read: 2.032 GB [ 2032330895 B] avg: 72.583 MB/sec [ 28 sec] cat /mnt/SAV/testfile.avi | wcs > /dev/null read: 2.032 GB [ 2032330895 B] avg: 67.744 MB/sec [ 30 sec] ----------- cat /mnt/CRYPT/testfile.avi | wcs > /mnt/SAV/testfile.avi read: 2.032 GB [ 2032330895 B] avg: 56.454 MB/sec [ 36 sec] cat /mnt/SAV/testfile.avi | wcs > /mnt/CRYPT/testfile.avi read: 2.032 GB [ 2032330895 B] avg: 54.928 MB/sec [ 37 sec] =============================== *** Server with Kernel 2.6.38-13-server #52 * From client, using NFS on crypted partition: cat /tmp/testfile.avi | wcs > /mnt/CRYPT/testfile.avi read: 2.032 GB [ 2032330895 B] avg: 54.928 MB/sec [ 37 sec] CPU=100% cat /mnt/CRYPT/testfile.avi | wcs > /tmp/testfile.avi read: 2.032 GB [ 2032330895 B] avg: 81.293 MB/sec [ 25 sec] CPU=98% <------------------- ----------- * From client, using NFS on non-crypted partition cat /tmp/testfile.avi | wcs > /mnt/SAV/testfile.avi read: 2.032 GB [ 2032330895 B] avg: 63.510 MB/sec [ 32 sec] CPU=50% cat /mnt/SAV/testfile.avi | wcs > /tmp/testfile.avi read: 2.032 GB [ 2032330895 B] avg: 63.510 MB/sec [ 32 sec] CPU=25% * From Server: cat /mnt/CRYPT/testfile.avi | wcs > /dev/null read: 2.032 GB [ 2032330895 B] avg: 84.680 MB/sec [ 24 sec] CPU=98% cat /mnt/SAV/testfile.avi | wcs > /dev/null read: 2.032 GB [ 2032330895 B] avg: 67.744 MB/sec [ 30 sec] CPU=25% ----------- cat /mnt/CRYPT/testfile.avi | wcs > /mnt/SAV/testfile.avi read: 2.032 GB [ 2032330895 B] avg: 52.111 MB/sec [ 39 sec] CPU=50%-100% cat /mnt/SAV/testfile.avi | wcs > /mnt/CRYPT/testfile.avi read: 2.032 GB [ 2032330895 B] avg: 47.264 MB/sec [ 43 sec] CPU=75%-100% _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
