Ok, thanks for the clarification. I mean each bvec consists of one page. It's not good for virtio backend. Hannes Reinecke <hare@xxxxxxx> 于2020年3月12日周四 下午7:51写道： > > On 3/12/20 12:13 PM, Feng Li wrote: > > Hi experts, > > > > May I ask a question about block layer? > > When running fio in guest os, I find a 256k IO is split into the page > > by page in bio, saved in bvecs. > > And virtio-blk just put the bio_vec one by one in the available > > descriptor table. > > > It isn't 'split', it's using _one_ bio containing bvecs, where each bvec > consists of one page. > > 'split' for the blocklayer means that a single I/O is split into several > bios, which I dont' think is the case here. Or? > > Cheers, > > Hannes > -- > Dr. Hannes Reinecke Kernel Storage Architect > hare@xxxxxxx +49 911 74053 688 > SUSE Software Solutions Germany GmbH, Maxfeldstr. 5, 90409 Nürnberg > HRB 36809 (AG Nürnberg), GF: Felix Imendörffer
