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smb3: increase initial number of credits requested to allow write

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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>
This commit is contained in:
Steve French 2018-06-13 17:05:58 -05:00
parent 290c3982f6
commit d409014e4f
1 changed files with 3 additions and 2 deletions
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5
fs/cifs/smb2pdu.c
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@ -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)