On Wed, 30 Mar 2011 22:12:23 +0400
Степан Фёдоров <stepan.fedorov@xxxxxxxx> wrote:
> Thanks all for attension, but question remains open: what can we do,
> to serve 1500-3000 LUNs from one node with no more then 24Gb of
> memory?
I'm away from the lab so I can work on this now but I'll.
Maybe the following patch works for you.
diff --git a/usr/bs_rdwr.c b/usr/bs_rdwr.c
index 77d52e3..9abec59 100644
--- a/usr/bs_rdwr.c
+++ b/usr/bs_rdwr.c
@@ -148,18 +148,23 @@ static void bs_rdwr_close(struct scsi_lu *lu)
close(lu->fd);
}
+static struct bs_thread_info rdwr_bst_info;
+
static int bs_rdwr_init(struct scsi_lu *lu)
{
- struct bs_thread_info *info = BS_THREAD_I(lu);
+ static int init;
+
+ if (!init) {
+ bs_thread_open(&rdwr_bst_info,
+ bs_rdwr_request, NR_WORKER_THREADS);
+ init = 1;
+ }
- return bs_thread_open(info, bs_rdwr_request, NR_WORKER_THREADS);
+ return 0;
}
static void bs_rdwr_exit(struct scsi_lu *lu)
{
- struct bs_thread_info *info = BS_THREAD_I(lu);
-
- bs_thread_close(info);
}
static int bs_rdwr_cmd_done(struct scsi_cmd *cmd)
@@ -177,6 +182,7 @@ static struct backingstore_template rdwr_bst = {
.bs_cmd_submit = bs_thread_cmd_submit,
.bs_cmd_done = bs_rdwr_cmd_done,
.bs_oflags_supported = O_SYNC | O_DIRECT,
+ .bs_private = (char *)&rdwr_bst_info,
};
__attribute__((constructor)) static void bs_rdwr_constructor(void)
diff --git a/usr/bs_thread.h b/usr/bs_thread.h
index d460032..c47690e 100644
--- a/usr/bs_thread.h
+++ b/usr/bs_thread.h
@@ -1,4 +1,4 @@
-#define NR_WORKER_THREADS 4
+#define NR_WORKER_THREADS 16
typedef void (request_func_t) (struct scsi_cmd *);
@@ -21,7 +21,7 @@ struct bs_thread_info {
static inline struct bs_thread_info *BS_THREAD_I(struct scsi_lu *lu)
{
- return (struct bs_thread_info *) ((char *)lu + sizeof(*lu));
+ return (struct bs_thread_info *)lu->bst->bs_private;
}
extern int bs_thread_open(struct bs_thread_info *info, request_func_t *rfn,
diff --git a/usr/tgtd.h b/usr/tgtd.h
index 37943d2..ea2414f 100644
--- a/usr/tgtd.h
+++ b/usr/tgtd.h
@@ -126,6 +126,7 @@ struct backingstore_template {
int (*bs_cmd_submit)(struct scsi_cmd *cmd);
int (*bs_cmd_done)(struct scsi_cmd *cmd);
int bs_oflags_supported;
+ char *bs_private;
struct list_head backingstore_siblings;
};
--
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