Following on from the latency bubbles in your IO posting. I have been asked two questions about this post privately:
- How can you map those long numbers in the output into readable entries, eg sd0.
- How can I confirm that disksort has been turned off?
The first one just requires another glob of D:
#
#pragma D option quiet
#define SD_TO_DEVINFO(un) ((struct dev_info *)((un)->un_sd->sd_dev))
#define DEV_NAME(un) \
stringof(`devnamesp[SD_TO_DEVINFO(un)->devi_major].dn_name) /* ` */
#define DEV_INST(un) (SD_TO_DEVINFO(un)->devi_instance)
fbt:ssd:ssdstrategy:entry, fbt:sd:sdstrategy:entry
{
bstart[(struct buf *)arg0] = timestamp;
} fbt:ssd:ssdintr:entry, fbt:sd:sdintr:entry
/ arg0 != 0 / {
this->buf = (struct buf *)((struct scsi_pkt *)arg0)->pkt_private;
}
fbt:ssd:ssdintr:entry, fbt:sd:sdintr:entry
/ this->buf /
{
this->priv = (struct sd_xbuf *) this->buf->b_private;
}
fbt:ssd:ssdintr:entry, fbt:sd:sdintr:entry
/ this->priv /
{
this->un = this->priv->xb_un;
}
fbt:ssd:ssdintr:entry, fbt:sd:sdintr:entry
/ this->buf && bstart[this->buf] && this->un /
{
@l[DEV_NAME(this->un), DEV_INST(this->un)] =
lquantize((timestamp - bstart[this->buf])/1000000, 0,
60000, 60000);
@q[DEV_NAME(this->un), DEV_INST(this->un)] =
quantize((timestamp - bstart[this->buf])/1000000);
bstart[this->buf] = 0;
}
The second required a little bit of mdb. Yes you can also get the same from dtrace mdb gives the the immediate answer, firstly for all the disks that use the sd driver and then for instance 1:
# echo '*sd_state::walk softstate | ::print -at "struct sd_lun" un_f_disksort_disabled' | mdb -k 300000ad46b unsigned un_f_disksort_disabled = 0 60000e23f2b unsigned un_f_disksort_disabled = 0 # echo '*sd_state::softstate 1 | ::print -at "struct sd_lun" un_f_disksort_disabled' | mdb -k 300000ad46b unsigned un_f_disksort_disabled = 0
This LINQ query is wired to a LinqDataSource by placing the code into the datasources Selecting event handler.
The outer ListView binds directly to the LinqDataSource we previously created. This outer ListView generates the grouping information contained within the outer OL element. Within the ItemTemplate of this ListView is another nested ListView that binds to the Employees property and generates the nested TABLE that contains items for each of the contacts within the current group.
The 2px solid line that appears before each grouping of contacts is actually the top border of the table (the table is shifted up by setting the top margin to a negative value). It is shifted up just enough that it aligns with the middle of the H2 element above it.
That's it. Enjoy! 