After applaying the next patch I can now see
in dmesg output:

ad4: 19574MB <IBM-DPTA-372050> [39770/16/63] at ata2-master tagged UDMA66
ad6: 19623MB <IC35L020AVER07-0> [39870/16/63] at ata3-master tagged UDMA66

        This configuration (ad6 is the IBM's Deskstar 60GXP(?) series
disk) was 'tested' by the 'make -j32 buildworld' with the /usr/obj
on the ad6 disk.

        Does this mean that this disk really support "tagged queueing" ?
Is there any way to test/demonstarte this ?



Index: sys/dev/ata/ata-disk.c
RCS file: /scratch/CVS/src/sys/dev/ata/ata-disk.c,v
retrieving revision 1.108
diff -b -u -r1.108 ata-disk.c
--- sys/dev/ata/ata-disk.c      2001/06/08 05:24:13     1.108
+++ sys/dev/ata/ata-disk.c      2001/06/20 11:17:05
@@ -841,7 +841,7 @@
 static int
 ad_tagsupported(struct ad_softc *adp)
-    const char *drives[] = {"IBM-DPTA", "IBM-DTLA", NULL};
+    const char *drives[] = {"IBM-DPTA", "IBM-DTLA", "IC35L020AVER07-0", NULL};
     int i = 0;
     /* Promise controllers doesn't work with tagged queuing */

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