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| author | Sowmini Varadhan <sowmini.varadhan@oracle.com> | 2016-04-22 18:36:36 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-04-25 16:54:14 -0400 |
| commit | 947d2756cddec83c72af99b02010002ddc57aeb3 (patch) | |
| tree | cb62fa6ec10edbc446d9f6ac37a07e9bafdd61b9 /net/rds | |
| parent | 6fa01ccd883021105e9f8af7d04b9f156fa3494a (diff) | |
| download | blackbird-obmc-linux-947d2756cddec83c72af99b02010002ddc57aeb3.tar.gz blackbird-obmc-linux-947d2756cddec83c72af99b02010002ddc57aeb3.zip | |
RDS: TCP: Call pskb_extract() helper function
rds-stress experiments with request size 256 bytes, 8K acks,
using 16 threads show a 40% improvment when pskb_extract()
replaces the {skb_clone(..); pskb_pull(..); pskb_trim(..);}
pattern in the Rx path, so we leverage the perf gain with
this commit.
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds')
| -rw-r--r-- | net/rds/tcp_recv.c | 14 |
1 files changed, 3 insertions, 11 deletions
diff --git a/net/rds/tcp_recv.c b/net/rds/tcp_recv.c index 27a992154804..d75d8b56a9e3 100644 --- a/net/rds/tcp_recv.c +++ b/net/rds/tcp_recv.c @@ -207,22 +207,14 @@ static int rds_tcp_data_recv(read_descriptor_t *desc, struct sk_buff *skb, } if (left && tc->t_tinc_data_rem) { - clone = skb_clone(skb, arg->gfp); + to_copy = min(tc->t_tinc_data_rem, left); + + clone = pskb_extract(skb, offset, to_copy, arg->gfp); if (!clone) { desc->error = -ENOMEM; goto out; } - to_copy = min(tc->t_tinc_data_rem, left); - if (!pskb_pull(clone, offset) || - pskb_trim(clone, to_copy)) { - pr_warn("rds_tcp_data_recv: pull/trim failed " - "left %zu data_rem %zu skb_len %d\n", - left, tc->t_tinc_data_rem, skb->len); - kfree_skb(clone); - desc->error = -ENOMEM; - goto out; - } skb_queue_tail(&tinc->ti_skb_list, clone); rdsdebug("skb %p data %p len %d off %u to_copy %zu -> " |
