Commit 9c6d4649 authored by suhua's avatar suhua Committed by Tomasz Zawadzki
Browse files

vhost: Fix the issue of virtual machine device parameter max_segments always equal to 1 



Solve the problem that the /sys/block/vd../max_segments is always 1 in the virtual
machine,and avoid the problem of low sequential read and write performance caused
by this limitation in the general block device layer of some lower kernels.

Signed-off-by: default avatarsuhua <suhua1@kingsoft.com>
Change-Id: I3289b4c6c74d9225f34e117f444f310bf8bc8ea2
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/975


Tested-by: default avatarSPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: default avatarBen Walker <benjamin.walker@intel.com>
Reviewed-by: default avatarShuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: default avatarChangpeng Liu <changpeng.liu@intel.com>
parent 4f7fa18d

lib/vhost/vhost_blk.c

+1 −1
Original line number Diff line number Diff line
@@ -919,6 +919,7 @@ vhost_blk_get_config(struct spdk_vhost_dev *vdev, uint8_t *config, 
	uint32_t blk_size;

	uint64_t blkcnt;



	memset(&blkcfg, 0, sizeof(blkcfg));

	bvdev = to_blk_dev(vdev);

	assert(bvdev != NULL);

	bdev = bvdev->bdev;
@@ -949,7 +950,6 @@ vhost_blk_get_config(struct spdk_vhost_dev *vdev, uint8_t *config, 
		}

	}



	memset(&blkcfg, 0, sizeof(blkcfg));

	blkcfg.blk_size = blk_size;

	/* minimum I/O size in blocks */

	blkcfg.min_io_size = 1;