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authorMike Christie <michaelc@cs.wisc.edu>2006-07-24 15:47:39 -0500
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2006-07-28 11:49:34 -0500
commitc8dc1e523b0f1e6dd71cdabd8c7d7587c6dc27f9 (patch)
tree466efa148c152f4330c92f02f81bc72e8f395114 /include
parent9aaa2b4621280b6de1ecfb6dd7cd5cbe59fd1264 (diff)
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[SCSI] iscsi bugfixes: reduce memory allocations
We currently try to allocate a max_recv_data_segment_length which can be very large (default is 64K), and common uses are up to 1MB. It is very very difficult to allocte this much contiguous memory and it turns out we never even use it. We really only need a couple of pages, so this patch has us allocates just what we know what we need today. Later if vendors start adding vendor specific data and we need to handle large buffers we can do this, but for the last 4 years we have not seen anyone do this or request it. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'include')
-rw-r--r--include/scsi/libiscsi.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index 3f69f7e..41904f6 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -135,6 +135,14 @@ struct iscsi_conn {
int id; /* CID */
struct list_head item; /* maintains list of conns */
int c_stage; /* connection state */
+ /*
+ * Preallocated buffer for pdus that have data but do not
+ * originate from scsi-ml. We never have two pdus using the
+ * buffer at the same time. It is only allocated to
+ * the default max recv size because the pdus we support
+ * should always fit in this buffer
+ */
+ char *data;
struct iscsi_mgmt_task *login_mtask; /* mtask used for login/text */
struct iscsi_mgmt_task *mtask; /* xmit mtask in progress */
struct iscsi_cmd_task *ctask; /* xmit ctask in progress */
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