From: "Elliott, Robert (Servers)" <elliott@hpe.com>
To: smitha sunder <sundersmitha@gmail.com>, fio <fio@vger.kernel.org>
Subject: RE: unaligned IO and starting LBA
Date: Wed, 16 Oct 2019 15:11:44 +0000 [thread overview]
Message-ID: <AT5PR8401MB116994768647E0EF0490F80DAB920@AT5PR8401MB1169.NAMPRD84.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <CA+zhgFSzBaH3q8TGZCet4WujqYBNqNA_kH3HavLoQY8FsmKFcQ@mail.gmail.com>
> -----Original Message-----
> From: fio-owner@vger.kernel.org [mailto:fio-owner@vger.kernel.org] On Behalf Of smitha sunder
> Sent: Tuesday, October 15, 2019 4:37 PM
> To: fio <fio@vger.kernel.org>
> Subject: unaligned IO and starting LBA
>
> Hello,
>
>
>
> I have a 512 byte formatted nvme drive and I want to send an unaligned
> IO and here’s the fio command line I am using , fio version fio-3.7
>
> # fio --name=job1 --filename=/dev/nvme0n1 --rw=randwrite
> --ioengine=libaio --number_ios=1 --debug=io --bs_unaligned=1
> --bs=1029
...
> Shouldn’t I see D7BD7CE as the starting LBA for the write based on the
> above offset (0x1af7af9cec) ?
Without direct=1 you're exercising the OS page cache logic,
not directly accessing the drive.
next prev parent reply other threads:[~2019-10-16 15:12 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-15 21:36 unaligned IO and starting LBA smitha sunder
2019-10-16 15:11 ` Elliott, Robert (Servers) [this message]
2019-10-16 17:18 ` smitha sunder
2019-12-19 3:27 ` Sitsofe Wheeler
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