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cifs: ask for more credit on async read/write code paths

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When doing a large read or write workload we only
very gradually increase the number of credits
which can cause problems with parallelizing large i/o
(I/O ramps up more slowly than it should for large
read/write workloads) especially with multichannel
when the number of credits on the secondary channels
starts out low (e.g. less than about 130) or when
recovering after server throttled back the number
of credit.

Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Aurelien Aptel 2021-03-04 17:51:48 +00:00 committed by Steve French
parent a249cc8bc2
commit 88fd98a230
1 changed files with 2 additions and 4 deletions
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6
fs/cifs/smb2pdu.c
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@ -4041,8 +4041,7 @@ smb2_async_readv(struct cifs_readdata *rdata)
if (rdata->credits.value > 0) {
shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
SMB2_MAX_BUFFER_SIZE));
shdr->CreditRequest =
cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
rc = adjust_credits(server, &rdata->credits, rdata->bytes);
if (rc)
@ -4348,8 +4347,7 @@ smb2_async_writev(struct cifs_writedata *wdata,
if (wdata->credits.value > 0) {
shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
SMB2_MAX_BUFFER_SIZE));
shdr->CreditRequest =
cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
rc = adjust_credits(server, &wdata->credits, wdata->bytes);
if (rc)