Control: reassign -1 src:linux On Lu, 11 mai 20, 18:03:00, Jim Knopf wrote: > In case anyone stumbles upon this thread looking for a solution, > there has been success here reverting a particular kernel patch > to sis900.c that occured between linux versions 3.11 and 3.12. > > The machine tested has been a Gericom Webboy (laptop from > year ~2000), it was connected to a tplink router. > > Systems with kernel versions 2.6.21.7, 2.6.27.27, 3.8.2 and 3.11 > had acceptable network performance, while a regression was > observed after booting 4.4.0 vanilla. With this version the net- > work adapter delivered a mere 100 kb/s, while in the megabyte > range with aforementioned versions. > > Backtracking the issue down to kernel 3.12.6 reliably exhibited > the same degradation for each kernel tested - flooding dmesg > log with the log patterns described earlier in this bug thread. > > Visiting the kernel changelogs between versions 3.11 and 3.12.6 > the following candidate patch could be identified as a possible > cause: > https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/net/ethernet/sis/sis900.c?h=v3.12&id=78f1ccc4f82cd7bbb65b0e938ed0dfd81e902fe0 > > The patch title is > sis900: don't restart auto-negotiation each time after link resume. > > .. applied to linux mainline on > 2013-08-20 > > Once this patch is reverted and 3.12.6 kernel recompiled, the > sis900 network card's performance was restored. This observation > has then been confirmed and reproduced by reverse applying the > patch to kernel 4.4.0. > > This patch may or may not be the cause for other setups employing > sis900 as a network chip, but has been reproducibly identified as > cause for performance degradation for the issue above. > > > The mii-tool workaround described earlier has worked as well, i.e. > without patching the sis900.c driver, setting 10baseT-FD only for > auto-negotiation events. (100baseTx-HD showed no improvement). > 10baseT-FD limits the network card's speed to about one mbyte/s, > which is inferior to proper patching of sis900 kernel driver. > > > Regards, > Jim
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