Hi Roland.
I opened bug 331 in the bugzilla with the following content:
When one tries to create a SRQ with many WR (> 16K WR), creation of the SRQ
fails.
The problem appears to be in the file: mthca_srq.c.
Here is the problematic code:
static int mthca_alloc_srq_buf(struct mthca_dev *dev, struct mthca_pd *pd,
struct mthca_srq *srq)
{
struct mthca_data_seg *scatter;
void *wqe;
int err;
int i;
if (pd->ibpd.uobject)
return 0;
srq->wrid = kmalloc(srq->max * sizeof (u64), GFP_KERNEL);
if (!srq->wrid)
return -ENOMEM;
which means that creating a SRQ with 16K WRs (or more), the driver will try to
allocate 16K*8=128K bytes using kmalloc. This is a very high amount of memory
to be allocated using kmalloc.
The fix can be replacing this kmalloc with a different type of memory
allocation.
Thanks
Dotan
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