Date: Sat, 9 Oct 2021 22:27:53 +0000 From: Rick Macklem <rmacklem@uoguelph.ca> To: "freebsd-current@freebsd.org" <freebsd-current@freebsd.org> Subject: Re: Writing large build logs to NFS extremely slow? Message-ID: <YQXPR0101MB0968B4900F28C0974E27B080DDB39@YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM> In-Reply-To: <YQXPR0101MB096840849470A4AA61C72188DDB39@YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM> References: <20211007021643.bwglyvrswk2nm3fl@nexus.home.palmen-it.de> <CAOgwaMsLTWaMddx1HPY0eiY4t-12x-bEiZmhUpFsuEqkNhM27w@mail.gmail.com> <20211009141852.3cmjh7tysnehum7b@nexus.home.palmen-it.de> <YQXPR0101MB096832C878E88DF877B39DB8DDB39@YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM> <20211009155033.fckg4i7zqo4yt2te@nexus.home.palmen-it.de> <YQXPR0101MB0968CA670A7AD47437D64E5FDDB39@YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM> <YQXPR0101MB096840849470A4AA61C72188DDB39@YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM>
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Rick Macklem wrote:=0A=
?Felix Palmen wrote:=0A=
[stuff snipped]=0A=
>>Ok, thanks for the insight here! So maybe, I could have a look at=0A=
>>poudriere's code? If I understand you correctly, keeping the file open=0A=
>>and just issuing more write() calls wouldn't trigger that problem?=0A=
>Nope, I don't think keeping the file open would help much.=0A=
>However, if the file is opened with O_DIRECT, you could try setting=0A=
># sysctl vfs.nfs.nfs_directio_enable=3D1=0A=
>in the NFS client machine.=0A=
Oops, my bad..I for some reason was thinking you were using an NFSv3=0A=
mount, but you didn't say. For NFSv4, repeated open/close of the same=0A=
file will result in significant overhead. The official remedy for this woul=
d=0A=
be enabling delegations, but there were some significant issues with using=
=0A=
them that were only fixed recently, so you need a really up to date system=
=0A=
if you are going to enable delegations on the NFSv4 server.=0A=
=0A=
rick=0A=
=0A=
rick=0A=
=0A=
> You could try the "nocto" mount option, which might help, if the log file=
=0A=
> is being re-opened many times, but I doubt it will help.=0A=
=0A=
Well, I take any suggestion, so will try that as well and report back,=0A=
thanks again!=0A=
=0A=
Side note, please don't CC/To me, I'm subscribed the list ;)=0A=
=0A=
--=0A=
Dipl.-Inform. Felix Palmen <felix@palmen-it.de> ,.//..........=0A=
{web} http://palmen-it.de {jabber} [see email] ,//palmen-it.de=0A=
{pgp public key} http://palmen-it.de/pub.txt // """""""""""=0A=
{pgp fingerprint} A891 3D55 5F2E 3A74 3965 B997 3EF2 8B0A BC02 DA2A=0A=
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