On 02/26, Mateusz Guzik wrote: > > On Wed, Feb 26, 2025 at 2:19 PM Mateusz Guzik <mjguzik@xxxxxxxxx> wrote: > > > Now that I sent the e-mail, I realized the page would have unread data > after some offset, so there is no room to *append* to it, unless one > wants to memmove everythiing back. Yes, but... even "memmove everything back" won't help if pipe->ring_size > 1 (PIPE_DEF_BUFFERS == 16 by default). > However, the suggestion below stands: Agreed, any additional info can help. Oleg. > > As for the bug, I don't see anything obvious myself. > > > > However, I think there are 2 avenues which warrant checking. > > > > Sapkal, if you have time, can you please boot up the kernel which is > > more likely to run into the problem and then run hackbench as follows: > > > > 1. with 1 fd instead of 20: > > > > /usr/bin/hackbench -g 16 -f 1 --threads --pipe -l 100000 -s 100 > > > > 2. with a size which divides 4096 evenly (e.g., 128): > > > > /usr/bin/hackbench -g 1 -f 20 --threads --pipe -l 100000 -s 128 > > > > -- > Mateusz Guzik <mjguzik gmail.com> >
