Am 24.05.2017 um 21:05 hat Alberto Garcia geschrieben:
> On Wed 24 May 2017 06:43:31 PM CEST, Anton Nefedov wrote:
> >> +if (m->data_qiov) {
> >> +qemu_iovec_reset(&qiov);
> >> +qemu_iovec_add(&qiov, start_buffer, start->nb_bytes);
> >> +qemu_iovec_concat(&qiov, m->data_
On Wed 24 May 2017 06:43:31 PM CEST, Anton Nefedov wrote:
>> +if (m->data_qiov) {
>> +qemu_iovec_reset(&qiov);
>> +qemu_iovec_add(&qiov, start_buffer, start->nb_bytes);
>> +qemu_iovec_concat(&qiov, m->data_qiov, 0, data_bytes);
>> +qemu_iovec_add(&qiov, end_buffe
If the guest tries to write data that results on the allocation of a
new cluster, instead of writing the guest data first and then the data
from the COW regions, write everything together using one single I/O
operation.
This can improve the write performance by 25% or more, depending on
several f
