Il 25/11/2013 16:55, Peter Lieven ha scritto: >> > chaning sparse_size from 65536 to 1048576 about 5% performance decrease... > > lieven@lieven-pc:~/git/qemu$ time ./qemu-img convert -pp -m 15728640 -S > 1048576 /tmp/VC-Ubuntu-LTS-12.04.2-64bit.qcow2 > iscsi://172.21.200.45/iqn.2001-05.com.equallogic:0-8a0906-9d95c510a-344001d54795289f-2012-r2-1-7-0/0 > > 40980480 of 40980480 sectors converted. > > real 0m29.263s > user 0m7.544s > sys 0m1.636s > lieven@lieven-pc:~/git/qemu$ time ./qemu-img convert -pp -m 15728640 -S > 4096 /tmp/VC-Ubuntu-LTS-12.04.2-64bit.qcow2 > iscsi://172.21.200.45/iqn.2001-05.com.equallogic:0-8a0906-9d95c510a-344001d54795289f-2012-r2-1-7-0/0 > > 40980480 of 40980480 sectors converted. > > real 0m28.169s > user 0m7.792s > sys 0m1.516s > lieven@lieven-pc:~/git/qemu$ time ./qemu-img convert -pp -m 15728640 -S > 65536 /tmp/VC-Ubuntu-LTS-12.04.2-64bit.qcow2 > iscsi://172.21.200.45/iqn.2001-05.com.equallogic:0-8a0906-9d95c510a-344001d54795289f-2012-r2-1-7-0/0 > > 40980480 of 40980480 sectors converted. > > real 0m27.643s > user 0m7.644s > sys 0m1.520s > > i wouldn't go over 64k until we fully understand which impact it has.
I agree. Paolo
