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From: Marcin Dalecki <mdcki@gmx.net>
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cc: freebsd-current@freebsd.org
Subject: Re: ata tagged queuing support question
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mitrohin a.s. wrote:
> helo.
> 
> ata-disk.c
> 
>     /* use tagged queueing if allowed and supported */
> #if 0 /* disable tags for now */
>     if (ata_tags && ad_tagsupported(adp)) {
> 	adp->num_tags = atadev->param->queuelen;
> 	adp->flags |= AD_F_TAG_ENABLED;
> 	adp->device->channel->flags |= ATA_QUEUED;
> 	if (ata_command(atadev, ATA_C_SETFEATURES,
> 			0, 0, ATA_C_F_DIS_RELIRQ, ATA_WAIT_INTR))
> 	    ata_prtdev(atadev, "disabling release interrupt failed\n");
> 	if (ata_command(atadev, ATA_C_SETFEATURES,
> 			0, 0, ATA_C_F_DIS_SRVIRQ, ATA_WAIT_INTR))
> 	    ata_prtdev(atadev, "disabling service interrupt failed\n");
>     }
> #endif
> 
> tagged queueing broken in -current? i have IBM ICxxxxxAV drives and want 
> to use this feature. can i enable this block?

Don't. It's very frequently broken by *hardware* and not worth the trouble
in terms of performance.