> Subject: Re: smbd_max_receive_size == 8192? > > ...ping? > > I have since noticed that the smbdirect default max send size is 1364, so I'm > even more confused on the 8192. And, ksmbd sets both sizes to 8192. Yes, it seems it can be reduced to a smaller value. I don't remember the reason why it was set to 8192 initially. This value is further override by the preferred_send_size in SMBD negotiation response from the server. In practice, it could be much lower than 8192. > > On 8/24/2022 11:44 AM, Tom Talpey wrote: > > Long, I notice that smbdirect.c sets the max receive size to 8192. > > It's tunable, but I'm curious why the default is so large. The > > SMBDirect protocol normally limits its packets to 1364 bytes. > > > > With an SMBDirect credit limit of 255, the present default allocates > > over 500 pages/connection, in O(2) granularity, when 85 O(1) pages > > would suffice. Kernel virtual mapping would also be greatly reduced as > > buffers can be arranged to share, and never extend beyond, a page. > > > > Any insight into the 8192? Thanks. > > > > Tom. > >
