Correct CC netdev@vger.kernel.org. Thanks,
Feng Li Li Feng <fen...@smartx.com> 于2019年6月21日周五 下午4:07写道： > > Hi, SPDK & Netdev, > > When running fio with SPDK iscsi target, > we find the localhost interface has a bad performance, > contrast to access from the remote node. > After upgrade the kernel to 5.1, this issue still exists. > > > There are some fio data of 4k randread, QD=128, jobs = 1: > iSCSI server run on the NODE1, fio run on NODE1 or NODE2. > > Fio + localhost(NODE1) + openiscsi + SPDK + NVMe > (3.10.0-693.11.6.el7) 62k > Fio + localhost(NODE1) + openiscsi + SPDK + NVMe (5.1 kernel) > 86k > Fio + remote node(NODE2) + openiscsi + SPDK + NVMe > (3.10.0-693.11.6.el7) 120k > > Try 1: > Connect localhost target with another interface ip (e.g. 10.0.xx.yy), > the performance is poor. The kernel driver could recognize this is a > local access, and use loopback directly. > > Try 2: > Setup a new namespace, and add another interface in this ns, and iSCSI > target listen on this interface. > Openiscsi connects from the current host, the performance is good. > > Question: > 1. Is this a known issue about the loopback? Any workaround? > 2. If this is no solution about loopback, how do we force the local > interface(127.0.0.1, and other nic interfaces) over the wire, not > directly pass in the host? > > Thanks, > Feng Li -- The SmartX email address is only for business purpose. Any sent message that is not related to the business is not authorized or permitted by SmartX. 本邮箱为北京志凌海纳科技有限公司（SmartX）工作邮箱. 如本邮箱发出的邮件与工作无关,该邮件未得到本公司任何的明示或默示的授权.
