Bad SCSI performance with 2.6.14 and Fusion-MPT

I'm seeing what looks to be the same problem (see: U320 SCSI negotiation problem in Linux 2.6.13 and later implementations on LSI Logic / Symbios Logic 53c1030 PCI-X Fusion-MPT Dual Ultra320 SCSI (rev 08)). [[I think I have a patch (perhaps suspect, but it works for me), if you're interested.]]

Alan D. Brunelle

Yeah, I'd like to see it. Interestingly another box with the same hardware setup and very slightly different .config works fine with 2.6.14.

best regards,
michael

It doesn't surprise me that a different .config or hardware change would affect this. If I understand the problem correctly, then it depends upon timing - and changing things (hw or sw) could affect the outcome.

The posting by

The following works for me - but as noted previously, it may be suspect in general: I'm concerned about the indefinate delay (theoretical).

diff -ur linux-2.6.14.mm2/drivers/message/fusion/mptbase.c linux-2.6.14.mm2.adb/drivers/message/fusion/mptbase.c
@@ -4994,7 +4994,9 @@
       if ((mf = mpt_get_msg_frame(mpt_base_index, ioc)) == NULL) {
               dcprintk((MYIOC_s_WARN_FMT "mpt_config: no msg frames!\n",
                               ioc->name));
-               return -EAGAIN;
+               do {
+                       msleep(25);
+               } while ((mf = mpt_get_msg_frame(mpt_base_index, ioc)) == NULL);
       }
       pReq = (Config_t *)mf;
       pReq->Action = pCfg->action;