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Date:      Fri, 29 Nov 2013 20:35:20 -0000
From:      "Steven Hartland" <>
To:        <>, <>
Subject:   Re: Fwd: Re: ssd for zfs
Message-ID:  <>
References:  <> <> <>

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You could add a DA_Q_NO_SYNC_CACHE quirk for you device
which will prevent the cam layer attempting to call sync but this
will only work if its attached to a SCSI controller like an LSI there's
no such quirk currently implemented in ATA cam layer.

----- Original Message ----- 
From: <>
To: <>
Sent: Friday, November 29, 2013 8:17 PM
Subject: Re: Fwd: Re: ssd for zfs

> Dear scsi-devs,
> It seems that my device handles the flush commands slowly. The linux 
> code avoids issuing this if the device reports its write cache is turned 
> off. That way my SSD works fast under linux, but infortunately slow 
> under FreeBSD. Actually I dont understand why is it slow for the flush 
> command, as it has power-loss-protection, maybe for such a command it 
> really flushes everything out, dont know. But when I enable the write 
> cache in linux also, the block layer gets knowledge of the write cache, 
> it issues the flush commands, and it gets same slow.
> How could this be solved?

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