Re: [PATCH v12 0/3] bio: control bio max size

Changheun Lee
2021-06-07T10:16:17Z

> On 6/3/21 10:03 PM, Changheun Lee wrote:
> > bio size can grow up to 4GB after muli-page bvec has been enabled.
> > But sometimes large size of bio would lead to inefficient behaviors.
> > Control of bio max size will be helpful to improve inefficiency.
> >
> > blk_queue_max_bio_bytes() is added to enable be set the max_bio_bytes in
> > each driver layer. And max_bio_bytes sysfs is added to show current
> > max_bio_bytes for each request queue.
> > bio size can be controlled via max_bio_bytes.
>
> Where is the version history for this patch series?

Sorry. I didn't know about it. I'll do next. Thank you for advise.

>
> Has this patch series been tested in combination with dm-crypt?

This patch has been tested in android device. And dm-crypt on the top of scsi
has tested with below scsi modification in VM too.

@@ -1837,6 +1837,8 @@ void __scsi_init_queue(struct Scsi_Host *shost, struct request_queue *q)
blk_queue_virt_boundary(q, shost->virt_boundary_mask);
dma_set_max_seg_size(dev, queue_max_segment_size(q));

+ blk_queue_max_bio_bytes(q, queue_max_sectors(q) << SECTOR_SHIFT);
+
/*
* Set a reasonable default alignment: The larger of 32-byte (dword),
* which is a common minimum for HBAs, and the minimum DMA alignment,

>
> Bart.
>

Thank you,
Changheun Lee