From: Steve French <stfrench@microsoft.com>
Date: Wed, 13 Jun 2018 17:05:58 -0500
Subject: [PATCH] smb3: increase initial number of credits requested to allow
write
Git-commit: d409014e4feeab486fb36b350abfc4c94de8be37
Patch-mainline: v4.18-rc1
References: bsc#1144333
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@gmail.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Acked-by: Aurelien Aptel <aaptel@suse.com>
---
fs/cifs/smb2pdu.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index af032e1a3eac..328e23abd241 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -990,8 +990,9 @@ SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
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)
--
2.16.4