4.17-stable review patch. If anyone has any objections, please let me know. ------------------ From: Steve French <stfrench@xxxxxxxxxxxxx> [ Upstream commit d409014e4feeab486fb36b350abfc4c94de8be37 ] Compared to other clients the Linux smb3 client ramps up credits very slowly, taking more than 128 operations before a maximum size write could be sent (since the number of credits requested is only 2 per small operation, causing the credit limit to grow very slowly). This lack of credits initially would impact large i/o performance, when large i/o is tried early before enough credits are built up. Signed-off-by: Steve French <stfrench@xxxxxxxxx> Reviewed-by: Ronnie Sahlberg <lsahlber@xxxxxxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/cifs/smb2pdu.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -923,8 +923,9 @@ SMB2_sess_alloc_buffer(struct SMB2_sess_ req->PreviousSessionId = sess_data->previous_session; req->Flags = 0; /* MBZ */ - /* to enable echos and oplocks */ - req->sync_hdr.CreditRequest = cpu_to_le16(3); + + /* enough to enable echos and oplocks and one max size write */ + req->sync_hdr.CreditRequest = cpu_to_le16(130); /* only one of SMB2 signing flags may be set in SMB2 request */ if (server->sign)
