Author: mav
Date: Thu Oct 1 19:07:15 2015
New Revision: 288458
URL: https://svnweb.freebsd.org/changeset/base/288458
Log:
More aggressively fill WUT read pipeline.
On some tests I've measured 5% copy speedup from this.
Modified:
head/sys/cam/ctl/ctl_tpc.c
Modified: head/sys/cam/ctl/ctl_tpc.c
==============================================================================
--- head/sys/cam/ctl/ctl_tpc.c Thu Oct 1 19:02:45 2015 (r288457)
+++ head/sys/cam/ctl/ctl_tpc.c Thu Oct 1 19:07:15 2015 (r288458)
@@ -1128,7 +1128,7 @@ static int
tpc_process_wut(struct tpc_list *list)
{
struct tpc_io *tio, *tior, *tiow;
- struct runl run, *prun;
+ struct runl run;
int drange, srange;
off_t doffset, soffset;
off_t srclba, dstlba, numbytes, donebytes, roundbytes;
@@ -1208,8 +1208,7 @@ tpc_process_wut(struct tpc_list *list)
// srclba, dstlba);
donebytes = 0;
TAILQ_INIT(&run);
- prun = &run;
- list->tbdio = 1;
+ list->tbdio = 0;
TAILQ_INIT(&list->allio);
while (donebytes < numbytes) {
roundbytes = numbytes - donebytes;
@@ -1262,8 +1261,8 @@ tpc_process_wut(struct tpc_list *list)
tiow->io->io_hdr.ctl_private[CTL_PRIV_FRONTEND].ptr = tiow;
TAILQ_INSERT_TAIL(&tior->run, tiow, rlinks);
- TAILQ_INSERT_TAIL(prun, tior, rlinks);
- prun = &tior->run;
+ TAILQ_INSERT_TAIL(&run, tior, rlinks);
+ list->tbdio++;
donebytes += roundbytes;
srclba += roundbytes / srcblock;
dstlba += roundbytes / dstblock;
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