Re: Disabling 9k jumbo clusters on mce(4)
On Fri, May 03, 2019 at 12:55:54PM -0400, Garrett Wollman wrote: > Does anyone have an easy patch to keep mce(4) from trying to use 9k > jumbo mbuf clusters? I think I went down this road once before but > the fix wasn't as obvious as it is for the Intel drivers. (I assume > the hardware is not so broken that it requires packets to be stored in > contiguous physical memory.) mce(4) only uses 9k clusters when you configured jumbo size larger than 4k. See r336407. ___ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
Re: Disabling 9k jumbo clusters on mce(4)
< said: > On Fri, May 03, 2019 at 12:55:54PM -0400, Garrett Wollman wrote: >> Does anyone have an easy patch to keep mce(4) from trying to use 9k >> jumbo mbuf clusters? I think I went down this road once before but >> the fix wasn't as obvious as it is for the Intel drivers. (I assume >> the hardware is not so broken that it requires packets to be stored in >> contiguous physical memory.) > mce(4) only uses 9k clusters when you configured jumbo size larger than 4k. > See r336407. Yes, and the point is to make it not use them *ever*, no matter what the MTU is. 9k clusters are Bad News; given the choice I would just as soon rip out all the code for greater-than-page-size clusters, but that would be way more divergence-from-upstream in my source tree than I can reasonably manage. -GAWollman ___ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
Re: Disabling 9k jumbo clusters on mce(4)
On Fri, May 03, 2019 at 03:37:11PM -0400, Garrett Wollman wrote: > < said: > > > On Fri, May 03, 2019 at 12:55:54PM -0400, Garrett Wollman wrote: > >> Does anyone have an easy patch to keep mce(4) from trying to use 9k > >> jumbo mbuf clusters? I think I went down this road once before but > >> the fix wasn't as obvious as it is for the Intel drivers. (I assume > >> the hardware is not so broken that it requires packets to be stored in > >> contiguous physical memory.) > > mce(4) only uses 9k clusters when you configured jumbo size larger than 4k. > > See r336407. > > Yes, and the point is to make it not use them *ever*, no matter what > the MTU is. 9k clusters are Bad News; given the choice I would just > as soon rip out all the code for greater-than-page-size clusters, but > that would be way more divergence-from-upstream in my source tree than > I can reasonably manage. In fact I was wrong, I forgot that code, sorry. It does not use clusters at all, instead the revision I mentioned loads a chain of mbufs of the MCLBYTES size for receive. Jumbo size only defines the number of mbufs. ___ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
