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smb3: only offload decryption of read responses if multiple requests 

No point in offloading read decryption if no other requests on the
wire

Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
This commit is contained in:
Steve French 2019-09-09 13:30:15 -05:00
parent 496902dc17
commit 10328c44cc
2 changed files with 7 additions and 4 deletions
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9
fs/cifs/cifsfs.c
View File

@ -1503,11 +1503,14 @@ init_cifs(void)
}
/*
* BB Consider setting limit!=0 maybe to min(num_of_cores - 1, 3) so we
* don't launch too many worker threads
* Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
* so that we don't launch too many worker threads but
* Documentation/workqueue.txt recommends setting it to 0
*/
/* WQ_UNBOUND allows decrypt tasks to run on any CPU */
decrypt_wq = alloc_workqueue("smb3decryptd",
WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
if (!decrypt_wq) {
rc = -ENOMEM;
goto out_destroy_cifsiod_wq;

2
fs/cifs/smb2ops.c
View File

@ -4121,7 +4121,7 @@ receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid,
* use more cores decrypting which can be expensive
*/
if ((server->min_offload) &&
if ((server->min_offload) && (server->in_flight > 1) &&
(server->pdu_size >= server->min_offload)) {
dw = kmalloc(sizeof(struct smb2_decrypt_work), GFP_KERNEL);
if (dw == NULL)