Justin Piszcz wrote: > On Wed, 16 Jan 2008, Al Boldi wrote: > > > Also, can you retest using dd with different block-sizes? > > I can do this, moment.. > > > I know about oflag=direct but I choose to use dd with sync and measure the > total time it takes. > /usr/bin/time -f %E -o ~/$i=chunk.txt bash -c 'dd if=/dev/zero > of=/r1/bigfile bs=1M count=10240; sync' > > So I was asked on the mailing list to test dd with various chunk sizes, > here is the length of time it took > to write 10 GiB and sync per each chunk size: > > 4=chunk.txt:0:25.46 > 8=chunk.txt:0:25.63 > 16=chunk.txt:0:25.26 > 32=chunk.txt:0:25.08 > 64=chunk.txt:0:25.55 > 128=chunk.txt:0:25.26 > 256=chunk.txt:0:24.72 > 512=chunk.txt:0:24.71 > 1024=chunk.txt:0:25.40 > 2048=chunk.txt:0:25.71 > 4096=chunk.txt:0:27.18 > 8192=chunk.txt:0:29.00 > 16384=chunk.txt:0:31.43 > 32768=chunk.txt:0:50.11 > 65536=chunk.txt:2:20.80 What do you get with bs=512,1k,2k,4k,8k,16k... Thanks! -- Al - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
