Re: REGRESSION in 2.6.13-rc1: Massive slowdown with Adaptec SCSI

["art" <art@usfltd.com>]

kernel 2.6.13-rc1-git7 after applaying patch transfer back to 72MB/s on aha19160 with 15k rpm seagate with reiserfs3 but possible deadlock in heavy IO - rsync ~50000-files from /mnt/seagate15k/a to /mnt/seagate15k/b ended in middle with deadlock of rsync (3 instances), pdflush, and gam_server in uninteruptible state -- system cannot kill this deadlocked uninterruptibles
any clue ???

thanx

xboom


patch-----

diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm.c b/drivers/scsi/aic7xxx/aic7xxx_osm.c
--- a/drivers/scsi/aic7xxx/aic7xxx_osm.c
+++ b/drivers/scsi/aic7xxx/aic7xxx_osm.c
@@ -2633,6 +2633,11 @@ static void ahc_linux_set_dt(struct scsi
 	ahc_unlock(ahc, &flags);
 }
 
+#if 0
+/* FIXME: This code claims to support IU and QAS.  However, the actual
+ * sequencer code and aic7xxx_core have no support for these parameters and
+ * will get into a bad state if they're negotiated.  Do not enable this
+ * unless you know what you're doing */
 static void ahc_linux_set_qas(struct scsi_target *starget, int qas)
 {
 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
@@ -2688,6 +2693,7 @@ static void ahc_linux_set_iu(struct scsi
 			 ppr_options, AHC_TRANS_GOAL, FALSE);
 	ahc_unlock(ahc, &flags);
 }
+#endif
 
 static struct spi_function_template ahc_linux_transport_functions = {
 	.set_offset	= ahc_linux_set_offset,
@@ -2698,10 +2704,12 @@ static struct spi_function_template ahc_
 	.show_width	= 1,
 	.set_dt		= ahc_linux_set_dt,
 	.show_dt	= 1,
+#if 0
 	.set_iu		= ahc_linux_set_iu,
 	.show_iu	= 1,
 	.set_qas	= ahc_linux_set_qas,
 	.show_qas	= 1,
+#endif
 };