> -----Original Message----- > From: linux-cifs-owner@xxxxxxxxxxxxxxx <linux-cifs-owner@xxxxxxxxxxxxxxx> On > Behalf Of Xiaoli Feng > Sent: Wednesday, January 16, 2019 6:36 PM > To: Steve French <smfrench@xxxxxxxxx> > Cc: CIFS <linux-cifs@xxxxxxxxxxxxxxx>; Xiong Zhou <xzhou@xxxxxxxxxx> > Subject: How to make wsize=16M > > Hello Steve, > From the mount.cifs man pages,the wsize can be 16M. I use samba server to > test on upstream. > But the wsize is always 8M if specify the wsize > 8M. How can I make > wsize=16M? The maximum write size is a negotiated value, which is typically server-limited to no more than 8MB. Here are some Windows-specific values, I'm sure Samba server defaults are similar. https://msdn.microsoft.com/en-us/library/cc246805.aspx#Appendix_A_226 It's generally a bad idea to set a huge operation size. Such r/w operations tie up the connection and cause many unpredictable and undesirable issues for other traffic, in addition to the significant resources to marshal and unmarshal them. Tom. > My test: > > # uname -r > 5.0.0-rc1+ > # mount //localhost/test cifs -o > user=root,password=redhat,wsize=16777216,vers=3.11 > # mount |grep cifs > //localhost/test on /root/cifs type cifs > (rw,relatime,vers=3.1.1,cache=strict,username=root,domain=,uid=0,noforceuid, > gid=0,noforcegid,addr=0000:0000:0000:0000:0000:0000:0000:0001,file_mode > =0755,dir_mode=0755,soft,nounix,serverino,mapposix,rsize=1048576,wsize=83 > 88608,echo_interval=60,actimeo=1,user=root) > > > -- > Best regards! > XiaoLi Feng 冯小丽 > > Red Hat Software (Beijing) Co.,Ltd > filesystem-qe Team > IRC:xifeng，#channel: fs-qe > Tel:+86-10-8388112 > 9/F, Raycom
