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[81.186.20.0]) by smtp.googlemail.com with ESMTPSA id 189sm2263748wma.6.2019.09.20.03.04.44 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 20 Sep 2019 03:04:44 -0700 (PDT) Subject: Re: rsize,wsize=1M causes severe lags in 10/100 Mbps From: Alkis Georgopoulos To: Trond Myklebust , "linux-nfs@vger.kernel.org" References: <3d00928cd3244697442a75b36b75cf47ef872657.camel@hammerspace.com> <7afc5770-abfa-99bb-dae9-7d11680875fd@gmail.com> <915fa536-c992-3b77-505e-829c4d049b02@gmail.com> <1d5f6643330afd2c04350006ad2a60e83aebb59d.camel@hammerspace.com> <5601db40-ee2f-262d-7d01-5c589c9a07eb@gmail.com> <20190919211912.GA21865@cosmos.ssec.wisc.edu> <503c22ad34b3f3a15015b7384bcad469b2899cb4.camel@hammerspace.com> <20190919221601.GA30751@cosmos.ssec.wisc.edu> <0213704b-3930-5be6-bd3d-dbaabc24a270@gmail.com> <1e7c9896-eb1b-9d7c-fff0-6df2b3d96392@gmail.com> Message-ID: <6fa596e9-b154-310e-9685-7663731618ba@gmail.com> Date: Fri, 20 Sep 2019 13:04:43 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <1e7c9896-eb1b-9d7c-fff0-6df2b3d96392@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org On 9/20/19 12:48 PM, Alkis Georgopoulos wrote: > I did test the boot bandwidth (I mean how many MB were transferred). > On ext4-over-NFS, with tmpfs-and-overlayfs to make root writable: I also tested with the kernel netbooting default of rsize=4K to compare. All on 100 Mbps, tcp,timeo=600: | rsize | MB to boot | sec to boot | |-------|------------|-------------| | 1M | 1250 | 84 | | 32K | 471 | 40 | | 4K | 320 | 31 | | 2K | 355 | 34 | It appears matching rsize=cluster size=4K gives the best results. Thank you, Alkis Georgopoulos