From: Dan Siemon <dan@coverfire.com>
To: "Magnus Karlsson" <magnus.karlsson@gmail.com>,
"Björn Töpel" <bjorn@kernel.org>
Cc: Xdp <xdp-newbies@vger.kernel.org>
Subject: Re: Umem Questions
Date: Wed, 19 May 2021 17:09:18 -0400 [thread overview]
Message-ID: <da5422fe0fd031212d6e422177979354207aa609.camel@coverfire.com> (raw)
In-Reply-To: <CAJ8uoz3HLFgGOMkVgKSvyiRBLSu+MoFPKUrSn0w6_s8--oVqOQ@mail.gmail.com>
> > 2) It looks like there is a limit of 2GB on the maximum Umem size?
> > I've
> > tried with and without huge pages. Is this fundamental? How hard
> > would
> > it be to increase this?
>
> This was news to me. Do you know where in the xdp_umem_reg code it
> complains about this? I guess it is xsk_umem__create() that fails,
> or?
> The only limit I see from a basic inspection of the code is that the
> number of packet buffers cannot be larger than a u32 (4G). But you
> are
> not close to that limit.
Yes, the failure is in xsk_umem__create(). I don't know where
specifically but there are a couple spots in kernel side of that which
return ENOMEM which is the return value.
next prev parent reply other threads:[~2021-05-19 21:09 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-14 14:34 Umem Questions Dan Siemon
2021-05-17 8:21 ` Magnus Karlsson
2021-05-19 21:09 ` Dan Siemon [this message]
2021-05-20 6:14 ` Magnus Karlsson
2021-05-20 12:40 ` Magnus Karlsson
2021-05-20 12:50 ` Magnus Karlsson
2021-05-21 18:17 ` Dan Siemon
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