From: Bhupesh Sharma <bhsha...@redhat.com> Date: Mon, 11 May 2020 15:41:40 +0530
... > Since kdump kernel(s) run under severe memory constraint with the > basic idea being to save the crashdump vmcore reliably when the primary > kernel panics/hangs, large memory allocations done by a network driver > can cause the crashkernel to panic with OOM. > > The qed* drivers take up approximately 214MB memory when run in the > kdump kernel with the default configuration settings presently used in > the driver. With an usual crashkernel size of 512M, this allocation > is equal to almost half of the total crashkernel size allocated. > > See some logs obtained via memstrack tool (see [1]) below: > dracut-pre-pivot[676]: ======== Report format module_summary: ======== > dracut-pre-pivot[676]: Module qed using 149.6MB (2394 pages), peak > allocation 149.6MB (2394 pages) > dracut-pre-pivot[676]: Module qede using 65.3MB (1045 pages), peak > allocation 65.3MB (1045 pages) > > This patchset tries to reduce the overall memory allocation profile of > the qed* driver when they run in the kdump kernel. With these > optimization we can see a saving of approx 85M in the kdump kernel: > dracut-pre-pivot[671]: ======== Report format module_summary: ======== > dracut-pre-pivot[671]: Module qed using 124.6MB (1993 pages), peak > allocation 124.7MB (1995 pages) > <..snip..> > dracut-pre-pivot[671]: Module qede using 4.6MB (73 pages), peak allocation > 4.6MB (74 pages) ... Series applied to net-next, thanks.
