bug#66288: 29.1; Performance regression using pipe for subprocess

[Eli Zaretskii]

> Date: Thu, 5 Oct 2023 01:54:43 +0300
> Cc: gregory@heytings.org, gerd.moellmann@gmail.com, 66288@debbugs.gnu.org
> From: Dmitry Gutov <dmitry@gutov.dev>
> 
> On 05/10/2023 01:49, Paul Eggert wrote:
> >> +      fcntl (inchannel, F_SETPIPE_SZ, readmax);
> > 
> > This call can fail if you aren't root and you exceed the system limit in 
> > /proc/sys/fs/pipe-max-size. So I suggest that if this fnctl fails with 
> > EPERM, trying it again after clipping to that limit.
> 
> Perhaps we'd rather fail loudly, so the user is aware that their 
> customized value cannot be applied.

Why not silently?  The clip_to_bounds call can already silently change
the original request anyway.