----- Original Message ----- > I'm assuming that these figures are bandwidth rather than times, since > that appears to show that the patch makes quite a large difference. > However the reclen is rather small. In the 32 bytes case, thats 128 > writes for each new block thats being allocated, unless of course that > is 32k? > > Steve.
Hi, To do this test, I'm executing this command: numactl --cpunodebind=0 --membind=0 /home/bob/iozone/iozone3_429/src/current/iozone -az -f /mnt/gfs2/iozone-gfs2 -n 2048m -g 2048m -y 32k -q 1m -e -i 0 -+n &> /home/bob/iozone.out According to iozone -h, specifying -y this way is 32K, not 32 bytes. The -q is maximum write size, in KB, so -q 1m is 1MB writes. The -g is maximum file size, in KB, so -g 2048 is a 2MB file. So the test varies the writes from 32K to 1MB, adjusting the number of writes to get the file to 2MB. Regards, Bob Peterson Red Hat File Systems
