From: Sagi Grimberg <sagi-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org>
To: Ming Lin <mlin-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-nvme-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>,
Steve Wise
<swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
Subject: Re: NVMe over RDMA latency
Date: Thu, 14 Jul 2016 09:52:18 +0300 [thread overview]
Message-ID: <578736A2.40402@grimberg.me> (raw)
In-Reply-To: <1468434332.1869.8.camel@ssi>
> With real NVMe device on target, host see latency about 33us.
>
> root@host:~# fio t.job
> job1: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=1
> fio-2.9-3-g2078c
> Starting 1 process
> Jobs: 1 (f=1): [r(1)] [100.0% done] [113.1MB/0KB/0KB /s] [28.1K/0/0 iops] [eta 00m:00s]
> job1: (groupid=0, jobs=1): err= 0: pid=3139: Wed Jul 13 11:22:15 2016
> read : io=2259.5MB, bw=115680KB/s, iops=28920, runt= 20001msec
> slat (usec): min=1, max=195, avg= 2.62, stdev= 1.24
> clat (usec): min=0, max=7962, avg=30.97, stdev=14.50
> lat (usec): min=27, max=7968, avg=33.70, stdev=14.69
>
> And tested NVMe device locally on target, about 23us.
> So nvmeof added only about ~10us.
>
> That's nice!
I didn't understand what was changed?
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next prev parent reply other threads:[~2016-07-14 6:52 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-07 19:55 NVMe over RDMA latency Ming Lin
2016-07-13 9:49 ` Sagi Grimberg
[not found] ` <CABgxfbEa077L6o-AxEqMr1WMuU-gC8_qc4VrrNs9nAkKLrysdw@mail.gmail.com>
[not found] ` <CABgxfbEa077L6o-AxEqMr1WMuU-gC8_qc4VrrNs9nAkKLrysdw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-07-13 17:25 ` Ming Lin
[not found] ` <57860EBA.5010103-NQWnxTmZq1alnMjI0IkVqw@public.gmane.org>
2016-07-13 18:25 ` Ming Lin
2016-07-14 6:52 ` Sagi Grimberg [this message]
2016-07-14 16:43 ` Wendy Cheng
[not found] ` <CABgxfbFST4Y=d9KyDetptwNv6Hf0iJfzWm3y2aavLD3PExDCQw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-07-14 17:45 ` Wendy Cheng
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